Boats and StreamsÂ Questions for IBPS PO, IBPS Clerk, IBPS RRB, SBI, LIC, IPPB, RBI and other exams. Boats and Streams Questions Bank PO.

- A boat can cover 25 km upstream and 42 km downstream together in 7 hours. Also it can cover 30 km upstream and 63 km downstream together in 9 hours. What is the speed of the boat in still water?

A) 13 km/hr

B) 8 km/hr

C) 7 km/hr

D) 11 km/hr

E) 16 km/hr

- A man rows to a certain place and comes back, but by mistake he covers 1/3rd more distance while coming back. The total time for this journey is 10 hours. The ratio of speed of boat to that of stream is 2 : 1. If the difference between upstream and downstream speed is 12km/hr, then how much time will the man take to reach to starting point from his present position?

A) 35 minutes

B) 45 minutes

C) 60 minutes

D) 40 minutes

E) 55 minutes

- A man can row at a speed of 15 km/hr in still water to a certain upstream point and back to the starting point in a river which flows at 9 km/hr. Find his average speed for total journey.

A) 10.4 km/hr

B) 8.4 km/hr

C) 9.1 km/hr

D) 5.2 km/hr

E) 9.6 km/hr

- A boat takes 5 hours for travelling downstream from point A to point B and coming back to point C at 3/4th of total distance between A and B from point B. If the velocity of the stream is 3 kmph and the speed of the boat in still water is 9 kmph, what is the distance between A and B?

A) 24 km

B) 32 km

C) 27 km

D) 21 km

E) 34 km

- At its usual rowing rate, a boat can travel 18 km downstream in 4 hours less than it takes to travel the same distance upstream. But if he the usual rowing rate for his 28-km round trip was 2/3rd, the downstream 14 km would then take 12 hours less than the upstream 14 km. What is the speed of the current?

A) 1.5 km/h

B) 3 km/h

C) 2 km/h

D) 3.5 km/h

E) 4 km/hr

- A boat can row to a place 120 km away and come back in 25 hours. The time to row 24 km with the stream is same as the time to row 16 km against the stream. Find the speed of current.

A) 1.5 km/h

B) 3 km/h

C) 2 km/h

D) 3.5 km/h

E) 4 km/hr

- A boatman can row 4 Km along the stream in 20 minutes and return in 24 minutes. Find the speed of boatman in still water.

A) 10 km/hr

B) 8 km/hr

C) 15 km/hr

D) 12 km/hr

E) 11 km/hr

- A man can row a certain distance downstream in 3 hours and return the same distance in 9 hours. If the speed of current is 18 km/hr, find the speed of man in still water.

A) 47 km/hr

B) 48 km/hr

C) 42 km/hr

D) 50 km/hr

E) 36 km/hr

- Four times the downstream speed is 8 more than 15 times the upstream speed. If difference between downstream and upstream speed is 24 km/hr, then what is the ratio of speed in still water to the speed of the current?

A) 9 : 2

B) 5 : 3

C) 7 : 1

D) 4 : 1

E) 7 : 3

- A boat can cover 14 km upstream and 21 km downstream together in 3 hours. Also it can cover 21 km upstream and 42 km downstream together in 5 hours. What is the speed of current?

A) 13 km/hr

B) 8 km/hr

C) 7 km/hr

D) 11 km/hr

E) 16 km/hr

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hello mam? koi h?

yes?

q1 correct h? mam

yess it is crct…

30kaha se aaya

sry mene solution nahi dekha .mene orally solve kiya and ans aa gya so

okk

A boat can cover 25 km upstream and 42 km downstream together in 7 hours. Also it can cover 40 km upstream and 63 km downstream together in 9 hours. What is the speed of the boat in still water?

A) 13 km/hr

B) 8 km/hr

C) 7 km/hr

D) 11 km/hr

E) 16 km/hr

View Answer

Option A

Solution:

Upstream speed in both cases is 25 and 30 resp. Ratio is 25 : 30 = 5 : 6. So let times in both cases be 5x and 6x

Downstream speed in both cases is 42 and 63 resp. Ratio is 42 : 63 = 2 : 3. So let times in both cases be 2y and 3y

So 5x + 2y = 7

and 6x + 3y = 9

Solve both, x = 1, y = 1

So upstream speed is = 25/5x = 5 km/hr

And downstream = 42/2y = 21 km/hr

So speed of boat is 1/2 * (5+21)

up dwn time

25 42 7

40 63 9

——————————

nw take hcf of downstream 42 and 63 = 21

so 21 km/hr is downstream speed

time in downstream= 42 km/21= 2 hr

as above given 25 up 42 dow total time 7

if in downtstream time 2 hrs then remaining time in upstream 7-2=5 hr

upstream speed= 25/5= 5 km/hr

speed of boat = (21+5)/2= 13 km/hr

ye new logic hai?

yessss

ty

i like it

one more qs

Four times the downstream speed is 8 more than 15 times the upstream speed. If difference between downstream and upstream speed is 24 km/hr, then what is the ratio of speed in still water to the speed of the current?

A) 9 : 2

B) 5 : 3

C) 7 : 1

D) 4 : 1

E) 7 : 3

current speed= (downstream- upstream)/2

= 24/2=12 km/hr

4 ( downstream)= 15( upstream)+8

4( x+ 12) = 15 (x-12) +8

on solving x=20 km /hr

boat speed: current speed

20:12

5:3

ty

wc

At its usual rowing rate, a boat can travel 18 km downstream in 4 hours less than it takes to travel the same distance upstream. But if he the usual rowing rate for his 28-km round trip was 2/3rd, the downstream 14 km would then take 12 hours less than the upstream 14 km. What is the speed of the current?

isko b krna apne usi method se plz mam

At its usual rowing rate, a boat can travel 18 km downstream in 4 hours less than it takes to travel the same distance upstream. But if he the usual rowing rate for his 28-km round trip was 2/3rd, the downstream 14 km would then take 12 hours less than the upstream 14 km. What is the speed of the current?

A) 1.5 km/h

B) 3 km/h

C) 2 km/h

D) 3.5 km/h

E) 4 km/hr

View Answer

Option B

muje ye quest abhi theek se samjh nii aya he …

ye 28 ki jagah kahin 18 to nhi?

i dnt knw..i am weak in these chapters like time nd distance

Plz help question smjh Ni aaya .you are genius

khan dikkt hai?

Ye pura hi smjh Ni as rha

wait

quiz over hone do

Ok wese sblog quiz me kahan participate krte h . I also want to participate in grouping quiz.

http://aspirantszone.com/discussion-zone-06-july-2017/

come here

up dwn time

25 42 7

40 63 9

——————————

nw take hcf of downstream 42 and 63 = 21

so 21 km/hr is downstream speed

time in downstream= 42 km/21= 2 hr

as above given 25 up 42 dow total time 7

if in downtstream time 2 hrs then remaining time in upstream 7-2=5 hr

upstream speed= 25/5= 5 km/hr

speed of boat = (21+5)/2= 13 km/hr

………..

esme doubt hai na u ko?

Nhi dusre me

vo mujhe ni aaya

thanks

ohh yes

its 30 km instead 40 km upstream

waii to mai confuse hu idhar EKTA bol rahi yee correct h..

yes. typo

mam 10No. qsn same type na

yes

mam to 1st me 25 42 and 40 63 ka ratio nikalna na?

nhi

upstreams ka alag se

n downstreams ka alag se

25 and 40

42 and 63

tabi then x and y me 1 equation bnegi

s s…

mam this question can be solved in 30 sec without forming equation. as it is time taking

How??

I will add in solution

up dwn time

25 42 7

40 63 9

——————————

nw take hcf of downstream 42 and 63 = 21

so 21 km/hr is downstream speed

time in downstream= 42 km/21= 2 hr

as above given 25 up 42 dow total time 7

if in downtstream time 2 hrs then remaining time in upstream 7-2=5 hr

upstream speed= 25/5= 5 km/hr

speed of boat = (21+5)/2= 13 km/hr

mam this can be apply

Nice yar thanks

welcome

hello

hello

mam cudose to u for ur great efforts…mam q 2 niii samjh aa rha muje

thankyou ðŸ™‚

in 2nd::

Points A to B k bich me travel karna hai

A to B downstream, then B to A upstream

But 1/3rd distance aage chli gai boat after A

now downstream to A to B travel hua

and then B to A + 1/3rd distance – upstream

Now is point se vapis A par ana hai – this time is to be found. — and in this downstream speed will be used

thank u mam

8/10… mam quest 5 also nt getting

it is – speed of stream will remain constant

first the speed of boat was x

and then 2x/3

In both cases for different journeys, different time is given

okk mam thank u

sorry

Ma’am que 6 right ha?

kyun ki 2nd condition follow nahi kr rhi same speed se

6th me 2nd condition?

yes

ye wali The time to row 21 km with the stream is same as the time to row 12 km against the stream. Find the speed of current.

dono ki timing alg-2 aa rhi

thanx maam plzz upload more sets high level

thnxxx done

ty az:)

ðŸ˜›

in question 2 how we will come to know that first he will go downstream and then up .why not reverse..??

8/10

Alternative method que no 10

21/x+y+14/x-y=3â€¦..1

42/x+y+21/x-y=3….2

Solve 1&2 these method correct???

yes i also followed this method.ans sahi aya..par yeh lenghty ho jata hai

9/10

q-6 ka ans 4 aa raha h….

5 que. couldn’t get it ….1st eqn,,18/x-18/y=4;;;; 2nd eqn. 42/2x-14/y=12….how to solve it quickly

x means downstream…y means upstream

…..