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2015-02-01T12:44:09+05:30

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Speed of sound = 300 m/s
distance travelled in 5 second = 300×5 = 1500m
distance travelled in 6 second = 300×6 = 1800m

If they are on opposite side of the source, the distance will be maximum
D = 1500+1800 = 3300m 

If they are on same side of the source, the distance will be minimum
D = 1800-1500 = 300m

So maximum distance is 3300m and minimum distance is 300m.
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