A car $P$ travelling at $20\,ms ^{-1}$ sounds its horn at a frequency of $400\,Hz$. Another car $Q$ is travelling behind the first car in the same direction with a velocity $40\,ms ^{-1}$. The frequency heard by the passenger of the car $Q$ is approximately $.......\,Hz$ [Take, velocity of sound $=360\,ms ^{-1}$ ]
JEE MAIN 2023, Medium
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