six girls share a flat with two bathroom which they use every morning begining at 7:00 o'clock. They use the bathroom one at a time, and sit down to eat breakfast together as soon as the last girl has finished. They spend 9,11,13,18,22 and 23 minutes in the bathroom respectively. Being well organised, what is the earliest they can have breakfast together?
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8 30 a it is the earliest for all girls
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