Question
Kimberly, Risa and Sarah were each given a piece of thread of equal length. Kimberly cut hers into equal lengths of 3 cm, Risa cut hers into equal lengths of 6 cm, and Sarah cut hers into equal lengths of 7 cm. If there were no remainder in each case, find the shortest length of thread given to each of them.
4 m

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Kimberly, Risa and Sarah were each given a piece of thread of equal length. Kimberly cut hers into equal lengths of 3 cm, Risa cut hers into equal lengths of 6 cm, and Sarah cut hers into equal lengths of 7 cm. If there were no remainder in each case, find the shortest length of thread given to each of them.