Question
A boat can travel 4.2km upstream in 14min. If the ratio
of the speed of the boat in still water to the speed of the stream is 7:1. How much time will the boat take to cover 17.6km downstream ?Solution
Speed = 7x : x
Downstream = 8x; upstream = 6x
Upstream speed = 4.2 x (60/14) = 18kmph
6x = 18
x = 3
Downstream = 8 x 3 = 24
Time taken for 17.6 km = 17.6 x (60/24) = 44 min
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