Question
The ratio of the speed of a launch in still water to
the speed of the stream is 8 : 1. If the speed of the launch is increased by 25%, it takes 5 hours to go 165 km downstream. Find the speed of the launch in still water.Solution
ATQ, Let, the speed of the launch in still water and the speed of the stream is 8x km/hr and x km/hr. The speed of the launch in still water after increased = 8x * 125/100 = 10x km/hr So, downstream speed after increase = (10x + x) = 11x km/hr 11x = 165/5 11x = 33 x = 3 The speed of the launch in still water = 8 * 3 = 24 km/hr
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