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Multiple Choice Questions

Anil can row 18 kmph in still water and he finds that it takes him twice as long to row up as to row...........

Qunatitative Aptitude (RBI Ast) Boats and Streams

Anil can row 18 kmph in still water and he finds that it takes him twice as long to row up as to row down the river. Find the rate of stream?

5 kmph

6 kmph

4 kmph

3 kmph

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Explanation:

?Option B
Solution:
Stream Speed = a kmph
Time Taken = x km
Downstream speed = (18 + a) kmph
Upstream speed = (18 – a) kmph
Time taken to travel downstream = 2 * Time taken to travel upstream
(18 + a) / x = 2(18 + a) / x
18 + a = 36 – 2a
3a = 18
a = 6 kmph
OR USE FORMULA
Speed of boat = [tu+td]/[tu-td] * Speed of stream
So 18 = [2x + x]/[2x – x] * Speed of stream