Question
A man rows a boat 27 kms in 6 hours downstream and
returns upstream in 18 hours. The speed of the stream (in km per hour) is:Solution
Rate downstream = 27/6 = 4.5 km/hr Rate upstream = 27/18 = 1.5 km/hr Now, speed of the stream = (rate downstream – rate upstream)/2 ⇒ (4.5 – 1.5)/2 = 1.5 km/hr
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