A classical mechanics problem by Sravan Kumar
Classical Mechanics
Level
1
A swimmer can swim 10 km in 2 hours when swimming along the flow of a river. While swimming against the flow, she takes 5 hours for the same distance. Her speed in still water (in km/h) is
The answer is 3.5.
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1 solution
Time= Distance/Velocity Let us consider swimmer velocity x and water flow velocity y
2=10/(x+y) and 5=10/(x-y)
by solving we get x= 3.5km/hour