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since, speed of sound is much more than that of the speed of the car therefore, we can hear the sound of horn before the car reaches us.

i hope it helps ...................... 
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Sound travels a lot faster than average speed of a car . Speed of sound in air is around 300 metre per second. So we can hear the sound of horn much before the car reaches us.. Hope it Helps... Pls mark as brainliest if it helps
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