A toy-car, blowing its horn, is moving with a steady speed of $5\, m/s$ , away from a wall. An observer, towards whom the toy car is moving, is able to hear $5\, beats$ per second. If the velocity of sound in air is $340\, m/s$, the frequency of the horn of the toy car is close to ... $Hz$
JEE MAIN 2016, Diffcult
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