A person standing between two parallel hills fires a gun.When will he hear third echo
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Since the man hears 1st echo after 3/2 sec. It takes sound 3/4 sec. to reach the hill.
Similarly in second case it took 5/4 sec for sound to reach second hill.
Hence, Total time taken by sound is 2 sec
Distance = speed * time
= 332 * 2
= 664
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