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A common race is a 5K race, where runners travel 5 kilometers. Is it more appropriate to report the distance as 5 kilometers or 5×10^6 millimeters?

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Answer:  5 kilometers

This version is much shorter, and more simpler, compared to 5 x 10^6 millimeters. It's more appropriate to use millimeters with very small objects or distances.

Note: 5 x 10^6 = 5,000,000 = 5 million

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