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A man swimming in a river finds that it takes him thrice the time to swim 2km upstream as it takes him to swim back.If the river flows at the rate of 1.5km/hr find the swimming speed of manin still water

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upstream the speed will be x-1.5

distance = 2km

time taken upstream = 2/(x-1.5)

..

downstream speed = x+1.5

distance = 2km

time taken = 2/(x+1.5)

..

he takes thrice the time upstream.

2/(x-1.5) = 3*(2/x+1.5)

(x+1.5)(x-1.5)=3

x^2-2.25=3

x^2= 0.75

=0.87 km/hr