A boat can travel 36 km upstream in 5 hours the speed of the stream is 2.4 kmph, how much time will the boat take to cover a distance of 78 km downstream? (in hours)
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let downstream speed be Xkmph
speed of stream = x- upstream speed
2.4= X - 7.2
X = 9.6kmph
speed = Distance/ time
time = 78 km /9.6 KMPH
time= 8.125 hours
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