Question
The speed of a boat in still water is 8 km/hr and the
speed of the stream is 1.5 km/hr. A man rows to a place at a distance of 30.875 km and comes back to the starting point. The total time taken by him is:Solution
Rate downstream = (8 + 1.5) kmph = 9.5 kmph Rate upstream = (8 – 1.5) kmph = 6.5 kmph According to the question, Time = Distance/Speed Hence, Required time = 30.875/9.5 + 30.875/6.5 = 3.25 + 4.75 = 8 hours
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