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41.
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A man rows to a place 48 km distance and back in
14 hours. He finds that he can row 4 km with the stream in the same time as 3
km against the stream. The rate of the stream is:
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A. 1 km/hr
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B. 2.5 km/hr
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C. 3 km/hr
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D. 4 km/hr
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Answer:
A.
Explanation:
Suppose
he moves 4 km downstream in x hours. Then,
Speed
downstream = [4/x] km/hr, Speed upstream = [3/x] km/hr.
∴ 48/(4+x) +
48/(3/x) = 14 or x = 1/2.
So,
Speed downstream = 8 km/hr, Speed upstream = 6 km/hr.
Rate
of the stream = 1/2 (8-6) km/hr = 1 km/hr.
