A swimmer's speed in the direction of fl...

A swimmer's speed in the direction of flow of rivers is 16 km `h^-1`. The swimmer's speed in still water and the velocity of flow of the river respectively are.

4 km `h^-1`, 12 km `h^-1`

12 km ^-1`

12 km `h^-1`, 12 km `h^-1`

4 km `h^-1`, 4 km `h^-1`

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12 km `h^-1`, 4 km `h^-1`

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