A boat travels 45 km upstream in 9 hours and 72 km downstream in 6 hours. Find the speed of the stream.
3.5 km/hr
Upstream speed = 45/9 = 5 km/h. Downstream speed = 72/6 = 12 km/h.
Speed of stream = (downstream − upstream) / 2 = (12 − 5) / 2 = 3.5 km/h.
Hence, the answer is 3.5 km/hr.
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