annsutton124 annsutton124

10-04-2018
Mathematics

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Mark can clean his father's office in 30 minutes. His younger sister Lynn can clean the office in 40 minutes. How long will it take if they come together and clean the office

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ohumphries5 ohumphries5

10-04-2018

If they each do half, it will take 35 minutes.

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kennakoko04 kennakoko04

10-04-2018

10 minutes is the answer

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