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There are two incline planes AO and OB i...

There are two incline planes `AO` and `OB` inclined at `45^(@)` and `60^(@)` respectively with the horizontal as shown in the figure. When a man moves on the inclined plane `AO` he is oberves that the rain drops are falling `45^(@)` with the vertical. When the man moves on the inclined plane `OB`, he observes that the raindrops are falling vertically downward with the horizontal. Then actual speed of rain is

A

`5sqrt(2) m//s`

B

`20sqrt(3) m//s`

C

`10sqrt(2) m//s`

D

None of these

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