A boat crosses a river with a velocity o...

A boat crosses a river with a velocity of `8(km)/(h)`. If the resulting velocity of boat is `10(km)/(h)` then the velocity of river water is

`12.8 "km h"^(-1)`

`6 " km h"^(-1)`

`8 " km h"^(-1)`

`10 " km h"^(-1)`

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