Question
The speed of a boat in still water is 13 km/hr and the
speed of the stream is 3 km/hr. A man rows to a place at a distance of 80 km and comes back to the starting point. The total time taken by him is:Solution
Rate downstream = (13 + 3) kmph = 16 kmph Rate upstream = (13 – 3) kmph = 10 kmph According to the question, Time = Distance/Speed Hence, Required time = 80/16 + 80/10 = 5 + 8 =13 hours
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