Question
The speed of a boat in still water isĀ 15 km/h , and
the speed of the stream isĀ 3 km/h . How much time will it take to travelĀ 36 km upstream Ā andĀ 54 km downstream ?Solution
Upstream speed = 15 ā 3 = 12 km/h Downstream speed = 15 + 3 = 18 km/h Time upstream = 36 / 12 = 3 hours Time downstream = 54 / 18 = 3 hours Total time = 3 + 3 = 6 hours
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