Question
A boat can travel 60km downstream in 4 hours. If the
speed of the boat in still water is 13 km/h, then in what time will it cover 30 km upstream?Solution
Downstream speed = 60 ÷ 4 = 15 km/h Speed of stream = 15 − 13 = 2 km/h Upstream speed = 13 − 2 = 11 km/h Time for 30 km upstream = 30 ÷ 11 = 2(8/11)
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