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Three children are walking. Their steps measure 36cm, 72cm and 90 cm. If they step from a line AB, their steps will fall together again at line CD. What is the distance between AB and CD?

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The distance between AB and CD will be 360 cm. 

The first child will take 10 steps to reach CD

second child will take 5 steps to reach CD and the third child will take 4 steps to reach CD

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