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You can estimate the distance of a thunderstorm in kilometers by counting the number of seconds between the lighting flash and the thunder and then dividing the number by 3. If a storm in 5km away how many seconds will you count between the lighting  flash and the thunder?

User Hithwen
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If the distance is equal to the counted number of seconds divided by 3, then multiply the distance by 3 to determine the number of counted seconds . . (5 km)(3) = 15 seconds counted between lightning and thunder.
User Danika
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