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A swimmer S is in the sea at a distance ...

A swimmer `S` is in the sea at a distance `dk m` from the closest point `A` on a straight shore. The house of the swimmer is on the shore at distance `Lk m` /h per hour and walk at a speed of `vk m//h` , `u

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The correct Answer is:
`(ud)/(sqrt(v^(2)-u^(2))`
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