A boat goes downstream and covers the distance between two ports in 4 hours . It covers the same distance in 6hours when it goes upstream. If speed of boat is 5 km/h ,vthen find the speed of water.
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Let the speed of water be x km/h
4[5+x]= 6[5-x]
20+ 4x = 30 - 6x
x= 1 km/h
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