Question
A boatman rows 5 km in 10 minutes, along the stream and
20 km in 2 hours against the stream. The speed of the stream is:Solution
Rate downstream = 5/10 x 60 = 30 km/hr Rate upstream = 20/2 = 10 km/hr Speed of current = 1/2 (Rate downstream – Rate upstream) ⇒ 1/2 (30 – 10) km/hr = 10 km/hr
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