Speed of a boat in still water is 10 kmph and speed of stream is 6 kmph. A man rows to a place at a distance of 32 km and come back to starting point. The total time taken by him is:
Rate upstream = 10 – 6 = 4 kmph Rate downstream = 10 + 6 = 16 kmph Time taken to go upstream = 32/4 = 8 hr Time taken to go downstream = 32/16 = 2 hr Total time = 8 + 2 = 10 hrs
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