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Q.
A person can row 8 1/2 km an hour in still water and he finds that it takes him twice as long to row up as to row down the river. The speed of the stream ?
A.
1.78 kmph
B.
2.35 kmph
C.
2.83 kmph
D.
3.15 kmph
View Answer
Correct choice: C
Explanation:
Given speed of the person = 8 1/2 = 17/2 kmph Let the speed of the stream = x kmph speed of upstream = 17/2 - x speed of downstream = 17/2 + x But given that, 2(17/2 - x) = 17/2 + x => 3x = 17/2 => x = 2.83 kmph.
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