Question
The speed of a boat in still water is 13 km/hr and the
speed of the stream is 4 km/hr. A man rows to a place at a distance of 76.5 km and comes back to the starting point. The total time taken by him is:Solution
Rate downstream = (13 + 4) kmph = 17 kmph Rate upstream = (13 – 4) kmph = 9 kmph According to the question, Time = Distance/Speed Hence, Required time = 76.5/17 + 76.5/9 = 4.5 + 8.5 = 13 hours
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