A man running on the horizontal road at ...

A man running on the horizontal road at ` 8 km h^(-1)` find the rain appears to be falling vertically. He incresases his speed to `12 km h^(-1)` and find that the drops make angle ` 30^2` with the vertical. Fin dthe speed and direction of the rain with respedt to the road.

`4 sqrt(7)` km/h

`9 sqrt(7)` km/h

`12 sqrt(7)` km/h

`15 sqrt(7)` km/h

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