Question

A truck is moving away at 30 mph from a car moving towards the truck at 60 mph. If
the truck emits a horn of frequency 500 Hz, what frequency does the driver of the car hear to 3
significant digits?

how do i solve i know the answer is 519hz but how?
the car is overtaking the truck

the relative speed is 30 mph
... the distance is closing
... that's why the Doppler frequency is higher

apparent frequency = actual frequency * [(speed of sound) / (speed of sound - closing speed)]

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