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A,B &C are three objects each moving wit...

`A,B &C` are three objects each moving with constant velocity. A's speed is `10m//sec` in a direction `vec(PQ)`. The velocity of `B` relative to `A` is `6m//sec` at an angle of, `cos^(-1) (15//24)` to `PQ`. The velocity of `C` relative to `B` is `12m//sec` in a direction `vec(PQ)`, then find the magnitude of the velocity of `C`.

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