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Speed of a boat in standing water is 12 kmph and the speed of the stream is 3 kmph. A man rows to a place at a distance of 6300 km and comes back to the starting point. The total time taken by him is:

A1120 hrs

B1000 hrs

C980 hrs

D850 hrs

Answer:

A. 1120 hrs

Read Explanation:

Explanation: 

Downstream speed = (12 + 3) = 15 km/hr

Upstream speed = (12 – 3) = 9 km/hr

Total time taken =630015+63009=\frac{6300}{15}+\frac{6300}{9}

= 420+700 ==> 1120hrs.


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