Question
A man rows a boat 60 kms in 4 hours downstream and
returns upstream in 12 hours. The speed of the stream (in km per hour) is:Solution
Rate downstream = 60/4 = 15 km/hr Rate upstream = 60/12 = 5 km/hr Now, speed of the stream = (rate downstream – rate upstream)/2 ⇒ (15 – 5)/2 = 5 km/hr
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