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Homework Statement
A car honks a 2kHz tone and is 40m from a long high wall. A man is running parallel to the wall, 10m away from it, at 5 m/s, and is presently 30m away from where the whistle is closest to the wall. How many beats/second will be heard by the runner as he will hear the direct whistle signal and the one reflected from the wall.
Homework Equations
The Attempt at a Solution
I have drawn a diagram and also knw that this problem has to do with the Doppler effect.
But i am not sure where to start.