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35.
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A man takes twice as long to row a distance
against the stream as to row the same distance in favour of the stream. The
ratio of the speed of the boat(in still water) and the stream is:
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A. 1:2
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B. 1:3
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C. 2:1
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D. 3:1
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Answer:
D.
Explanation:
Let
man’s rate upstream be x kmph. Then, his rate downstream = 2x kmph.
∴ (Speed in still water) : (Speed of
stream)
=
[2x + x / 2] : [2x - x / 2]
3x
/ 2 : x / 2 = 3:1.
