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Question: Anyone who has witnessed a fireworks display has direct evidence that light travels much faster than sound. It takes about 5s for sound to travel 1 mile (1.6 km). How long does it take light to travel the same distance? If you hear an explosion 3 s after you see its flash, how far away did it occur? Write an equation relating distance to the time delay. Amaze your friends next July 4!

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