1.

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)

Answer»

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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