Explain why we always hear the thunder a little after we see the flash of lightning.

We hear thunder a little after we see flash of lightning because speed of light is more than speed of sound. 

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Light's speed in air is 3?10^8 m/s^2...while sound speed in air is 332m/s..so light speed is more than sound..so the lightning and thunder takes place simultaneously but we see the lightning at first...then thunderis heard by us
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