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# Boats and Streams Questions

Home > Quantitative Aptitude > Boats and Streams > General Questions
NA
SHSTTON
39
Solv. Corr.
31
Solv. In. Corr.
70
Attempted
1 M:30 S
Avg. Time

1 / 3

Choose the correct option.

A man swims downstream 30 km and upstream 18 km taking 3 hours each time, what is the speed of the man in still water?

A2 kmph

B8 kmph

C16 kmph

D4 kmph

Explanation:

Man's downstream speed = 30/3 kmph = 10 kmph

Man's upstream speed = 18/3 kmph = 6 kmph

Speed of man in still water = (10 + 6)/2 = 8 kmph

Workspace

NA
SHSTTON
21
Solv. Corr.
21
Solv. In. Corr.
42
Attempted
0 M:0 S
Avg. Time

2 / 3

Choose the correct option.

A boat sails 15 km of a river towards upstream in 5 hours. How long will it take to cover the same distance downstream, if the speed of current is one-fourth the speed of the boat in still water:

A1.8h

B4h

C3h

D5h

ENone of these

Explanation:

Let's assume Boat speed in still water = x kmph
and current speed = y kmph.

so boat Upstream speed = (x-y) kmph

Boat Downstream speed = (x+y) kmph

as per the question
(x - y) = 15/5 = 3 km/h ---------------(1)

Given x= 4y (speed of current is 1/4 of boat speed in still water)

so form eq. (1 )
4y-y = 3 => y = 1 kmph so x= 4 km/h

So boat downstream speed (x+y) = 5km/h

=> Time required in downstream = 15/5 = 3h

Workspace

NA
SHSTTON
3
Solv. Corr.
31
Solv. In. Corr.
34
Attempted
0 M:0 S
Avg. Time

3 / 3

Choose the correct option.

A boat covers a certain distance downstream in 1 hour, while it comes back in 1 hours. If the speed of the stream be 3 kmph, what is the speed of the boat in still water?

A12 kmph

B13 kmph

C14 kmph

D15 kmph

Explanation:

Let the speed of the boat in still water be x kmph. Then,
Speed downstream = (x + 3) kmph, Speed upstream = (x - 3)kmph.
? (x + 3) * 1 = (x -3) * 3/2 ? 2x + 6 = 3x - 9 ? x = 15 kmph.

Workspace

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