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Two trains, each moving with a velocity ...

Two trains, each moving with a velocity of 30 `ms^-1`, cross each other. One of the trains gives a whistle whose frequency is 600 Hz. If the speed of sound is 330 `ms^-1`, the apparent frequency for passengers sitting in the other train before crossing would be

A

600 Hz

B

630 Hz

C

930 Hz

D

720 Hz

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