Answers

2016-04-25T21:57:10+05:30
Look, Speed 'v'of sound=340 mps Distance, s=500m {2s=v*t} T=2s/u 2(500)=340xt 1000=340t T=1000/340 5=3[approximately] .... Uffdarm physics
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Ups, sorry... The last step was t=3 [approximately]