A marathon is a 26.2-mile race that commemorates the run made by a Greek soldier, Pheidippides, that took place in 490 BCE. How many kilometers did he run? (Note: 1 mi = 1.6 km.)

Convert miles to kilometers by multiplying by 1.6: 26.2 × 1.6 = 41.92 km. Rounded to the nearest tenth, Pheidippides ran 41.9 km, so the correct choice is 41.9 km.

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