Question
Speed of a boat in still water is 12 kmph and speed of
stream is 6 kmph. A man rows to a place at a distance of 72 km and come back to starting point. The total time taken by him is:Solution
Rate upstream = 12 – 6 = 6 kmph Rate downstream = 12 + 6 = 18 kmph Time taken to go upstream = 72/6 = 12 hr Time taken to go downstream = 72/18 = 4 hr Total time = 12 + 4 = 16 hrs
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