A common method for estimating the distance to(adsbygoogle = window.adsbygoogle || []).push({});

a lightning flash is to begin counting when the flash is

observed and continue until the thunder clap is heard.

The number of seconds counted is then divided by 3 to

get the distance in kilometers. What is the velocity

of sound in kilometers per second?

(The speed of light is 3*10^8 m/s.)

I have no idea how to start this problem, please help?

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# Velocity of lightning

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