Question
The speed of a boat in still water is 12 km/h , and
the speed of the stream is 3 km/h . How much time will it take to travel 30 km upstream  and 30 km downstream ?Solution
Upstream speed = 12 − 3 = 9 km/h Downstream speed = 12 + 3 = 15 km/h Time upstream = 30 / 9 = 10/3 hours Time downstream = 30 / 15 = 2 hours Total time = 10/3 + 2 = 10/3 + 6/3 = 16/3 hours = 5⅓ hours
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