Answers

2016-01-14T12:30:07+05:30
see the attached document please.......
 i hope it helps............
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2016-01-14T12:46:52+05:30
We know that the speed of light is more than the speed of sound in air, so we always see the lightening first and heard the sound later .
now,A/q
distance = speed × time 
              = 330×30
              = 9900 m
              = 9.9 km
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