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A girl standing on road holds her umbrel...

A girl standing on road holds her umbrella at `45^@` with the vertical to keep the rain away. If she starts running without umbrella with a speed of `15sqrt2 kmh^(-1)` , the rain drops hit her head vertically. The speed of rain drops with respect to the moving girl is :

A

`30 "kmh"^(-1)`

B

`25/sqrt2 "kmh"^(-1)`

C

`30/sqrt2 "kmh"^(-1)`

D

`25 "kmh"^(-1)`

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