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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)/(h)` and `36(km)/(h)`. If second car blows born of frequency 280 Hz, then the frequency of horn heard by the driver of first car when the line joining the cars makes angle of `45^@C` with the roads, will be (velocity of sound is `330(m)/(s)`)

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