Speed of a boat in standing water is 9 kmph and the speed of the stream is 1.5 k

Question

Speed of a boat in standing water is 9 kmph and the speed of the stream is 1.5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is:

Options:

A . 16 hours

B . 18 hours

C . 20 hours

D . 24 hours

Answer: Option D

Speed upstream = 7.5 kmph.

Speed downstream = 10.5 kmph.

So, Total time taken = \(\left(\frac{105}{7.5}+\frac{105}{10.5}\right)hours =24hours\)

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