In still water a swimmer has a velocity of 4km/h. River is flowing at the velocity of 3km/h, with respect to water. The swimmer keeps his direction perpendicular to the flow. Determine the swimmer's velocity with respect to the ground.
A
4km/h
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B
5km/h
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C
6km/h
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D
7km/h
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Solution
The correct option is D5km/h Velocity in still water (v1)=4km/h