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To find the length of Marc's track, we need to find the least common multiple (LCM) of 4 inches and 10 inches.
The prime factorization of 4 is 2^2.
The prime factorization of 10 is 2 * 5.
The LCM of 4 and 10 is 2^2 * 5 = 20 inches.
Therefore, Marc's track will be 20 inches long when it is the same length as Aki's track.