A swimmers speed in the direction of flow of river is \( 16 \mathrm{~km} \) \( \mathrm{h}^{-1} \...

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A swimmers speed in the direction of flow of river is \( 16 \mathrm{~km} \) \( \mathrm{h}^{-1} \). Swimmers speed against the direction of flow of river is \( 8 \mathrm{~km} \mathrm{~h}^{-1} \). Calculate the swimmers speed in still water and the velocity of flow of the river (in \( \mathrm{km} \mathrm{h}^{-1} \) ).
(a) 2,8
(b) 12,4
(c) 4,8
(d) 8,2
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