Speed of a boat in still water is 8 kmph and speed of stream is 1 5 kmph A man rows to a place at a ...........

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Speed of a boat in still water is 8 kmph and speed of stream is 1.5 kmph. A man rows to a place at a distance of 61.75 km and come back to starting point. The total time taken by him.

6 hrs

8 hrs

16 hrs

22 hrs

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Explanation:

Rate upstream = 8 – 1.5 = 6.5 kmph
Rate downstream = 8 + 1.5 = 9.5 kmph
Time taken to go upstream = 61.75/6.5 = 9.5 hr
Time taken to go downstream = 61.75/9.5 = 6.5 hr
Total time = 9.5 + 6.5 = 16 hrs.