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The apparent frequency of the whistle of...

The apparent frequency of the whistle of an engine changes in the ratio 6:5 as the engine passes a stationary observer. If the velocity of sound is `330(m)/(s)`, then the velocity of the engine is

A

40 m/s

B

20 m/s

C

340 m/s

D

180 m/s

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The correct Answer is:
A
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