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One child can dig a large hole in the sand in four minutes and the second child takes 9 minutes so how long would it take 2 children to dig a hole of the same size?
Child A digs 1/4 per minute, child B digs 1/9 per minute so between them they should dig 13/36ths per minute and would take 36/13 ie just over 2 minutes 46 seconds.
BUT they would argue and get in each other's way so it would probably take longer than if the quick digger worked alone!
What else can I help you with?
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