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51.
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A
man can row 9 1/3 kmph in still water and finds that it takes him thrice as
uch time to row up than as to row down the same distance in the river. The
speed of the current is:
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A. 3
1/2 km/hr
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B. 2
1/3 km/hr
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C. 4
1/2 km/hr
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D. 4
2/3 km/hr
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Answer:
D.
Explanation:
Let
speed upstream be x kmph. Then, speed downstream = 3x kmph.
Speed
in still water = 1/2(3x + x) kmph = 2x kmph.
∴ 2x = 28/3 ⇒ x = 14/3
So,
Speed upstream = 14/3 km/hr; Speed downstream = 14/hr.
Hence,
speed of the current = 1/2 [14 - 14/3] km/hr = 14/3 km/hr = 4 2/3 km/hr.
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Title : BOATS and STREAMS Q51
Description : 51. A man can row 9 1/3 kmph in still water and finds that it takes him thrice as uch time to row up than as to row d...
Rating : 5
