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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 km/hr and 36 km/hr. If first car blows horn of frequency 280 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

A

321 Hz

B

298 Hz

C

289 Hz

D

280 Hz

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