Question
Speed of a boat in still water is 10 kmph and speed of
stream is 8 kmph. A man rows to a place at a distance of 54 km and come back to starting point. The total time taken by him is:Solution
Rate upstream = 10 – 8 = 2 kmph Rate downstream = 10 + 8 = 18 kmph Time taken to go upstream = 54/2 = 27 hr Time taken to go downstream = 54/18 = 3 hr Total time = 27 + 3 = 30 hrs
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