Question

a person can swim in the river flow direction with a speed 6 km per hour the same person can swim in opposite direction to river flow with a speed of 2 km per hour what is the speed of the person in still water

Answer 1

let speed of water be y
nd speed of man be x
then , x+y= 6(with water)
x-y=2
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add---2x= 8
so, x=4
speed of person in still water = 4 km /hr