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Two cars are moving on two perpendicular...

Two cars are moving on two perpendicular roads towards a crossing with uniform speeds of 72 kmph and 36 kmph. If first car blows horn of frequency 300 Hz, then the frequency of horn heard by the driver of second car when line joining the cars make 45° angle with the roads will be (Speed of sound = 330 m/s)

A

340 Hz

B

280 Hz

C

289 Hz

D

320 Hz

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