Question
The speed of a boat in still water is 8 km/hr and the
speed of the stream is 2 km/hr. A man rows to a place at a distance of 30 km and comes back to the starting point. The total time taken by him is:Solution
Rate downstream = (8 + 2) kmph = 10 kmph Rate upstream = (8 – 2) kmph = 6 kmph According to the question, Time = Distance/Speed Hence, Required time = 30/10 + 30/6 = 3 + 5 = 8 hours
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