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 :
Speed Upstream = 7.5 kmph.
Speed Downstream = 10.5 kmph.
Total time taken = [10.5/7.5 + 105/10.5] hours
= 24 hours
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