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Since, the three persons start walking together.
Therefore, The minimum distance covered by each of them in complete steps = LCM of the measures of their steps = LCM (40, 42, 45)
40 = 2 x 2 x 2 x 5 = 2^3 x 5
42 = 2 x 3 x 7
45 = 3 x 3 x 5 = 3^2 x 5
=> LCM (40, 42, 45) = 23 x 32 x 5 x 7 = 2520
=> Each person should walk a minimum distance of 2520 cm in complete steps.
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