Speed of a boat in still water is 11 kmph and speed of stream is 9 kmph. A man rows to a place at a distance of 40 km and come back to starting point. The total time taken by him is:
Rate upstream = 11 – 9 = 2 kmph Rate downstream = 11 + 9 = 20 kmph Time taken to go upstream = 40/2 = 20 hr Time taken to go downstream = 40/20 = 2 hr Total time = 20 + 2 = 22 hrs
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