Farhan, Nora, and Devi are given 3 rods of equal lengths. Farhan cuts his rod
into smaller pieces of equal length of 42 cm; Nora cuts her rod into smaller
pieces of equal length of 24 cm and Devi cuts her rod into smaller pieces of
equal length of 60 cm. If there are no rods leftover, what is the shortest
possible length of rod given to each of them?.

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