Question
A boat takes 8 hours to travel 240 km upstream. If the
speed of the boat in still water is 40 km/h, how much time will it take for the boat to travel 120 km downstream?Solution
Let the speed of the stream be x km/hr. So, upstream speed = (40 – x) km/hr According to the question, 240/(40 – x) = 8 x = 10 km/hr So, downstream speed = 40 + x = 40 + 10 = 50 km/hr Required time taken to cover the distance = 120/50 = 2.4 hours
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