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As speed of light >> speed of sound, we can safely assume that the time taken for light to reach the observer is negligeable.

Taking speed of sound to be 340 ms-1 The distance can be found out by the formula

Distance = Speed * Time

= 340 * 3.4

= 1156 m

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Q: During a thunderstorm 3.4 s elapses between observing a lightning flash and hearing the resulting thunder Approximately how far away in kilometers and miles was the lightning flash?
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