Question
The ratio of the speed of the boat in still water to
the speed of the stream is 5 : 1. If the speed of the boat is increased by 40%, then the time taken to cover 288 km downstream is 12 hours. Find the speed of the boat in still water.Solution
ATQ, Let, the speed of the boat in still water and the speed of the stream is 5x km/hr and x km/hr. The speed of the boat in still water after increased = 5x * 140/100 = 7x km/hr So, downstream speed after increase = (7x + x) = 8x km/hr 8x = 288/12 8x = 24 x = 3 The speed of the boat in still water = 5 * 3 = 15 km/hr
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