Question
A man rows a boat 54 kms in 6 hours downstream and
returns upstream in 10 hours. The speed of the stream (in km per hour) is:Solution
Rate downstream = 54/6 = 9 km/hr Rate upstream = 54/10 = 5.4 km/hr Now, speed of the stream = (rate downstream – rate upstream)/2 ⇒ (9 – 5.4)/2 = 1.8 km/hr
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