A boat can travel 11.4km downstream in 32 min.If the speed of the current is 3 km/h,how much time the boat will take to travel 84 km upstream ?
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Answer:
let x speed of boat and y is the speed of stream in km/hr
downstream x-y km/hr
x-3 = 11.4x60/32 km/hr
on solving we get x = 21.375km/hr
upstream x+y km/hr
21.375 + 3 = 84/T
on solving we get T = 3.44 hr
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