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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 a place at a distance of 105 km and comes back to the starting point. The total time taken by him is:

16 hours
18 hours
20 hours
24 hours

Correct Answer: 24 hours

Explanation:

Speed upstream = 7.5 kmph.

Speed downstream = 10.5 kmph.

∴ Total time taken =	❨	105	+	105	❩hours = 24 hours.
		7.5		10.5

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