25. A boat travels 30 km upstream in the same amount of time it takes to travel 60 km
downstream in the same river. If the speed of the river is 4 km/h, find the speed of the
boat in still water.
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Answer:
speed of current (water) = 4km/hr
speed of Boat = x
upstream = (x-4)30
Downstream = (x+4)60
D = D
(x-4)30 = (x+4)60
30x+120 = 60x-240
120+240 = 60x-30x
360 = 30x
360/30 = x
12 = x
Therefore, the speed of the boat in still water is 12km/h
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