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A train is moving with speed 72 km/h tow...

A train is moving with speed 72 km/h towards a hill blows a whistle of frequency 1240Hz. the frequency of echo heard by driver is(speed of sound=330m/s)

A

1440 Hz

B

1400 Hz

C

1320 Hz

D

1420 Hz

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The correct Answer is:
B
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