A swimmer can swim in still water at a r...

A swimmer can swim in still water at a rate 4.0 km/h. If he swims in a river flowing at 3.0 km/h and keeps his direction (with respect to water) perpendicular to the current, find his velocity with respect to the ground.

`3 km//hr`

`5 km//hr`

`4 km//hr`

`7 km//hr`

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