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53.
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Speed of a boat in standing water is 9 kmph and
the speed of the stream is 1.5 kmph. A man rows to place at a distance of 105
km and comes back to the starting point. The total time taken by him is:
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·
A. 12
hours
·
B. 24
hours
·
C. 36
hours
·
D. 48
hours
|
Answer:
B.
Explanation:
Speed
upstream = 7.5 kmph; Speed downstream = 10.5 kmph.
∴ total time
taken = [105/7.5 + 105/10.5] hours = 24 hours.
