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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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2 votes
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

User Tobias Baaz
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8.6k points

2 Answers

3 votes
10 minutes is the answer

User Nuke
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7.2k points
1 vote
If they each do half, it will take 35 minutes.
User Mykola Korol
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8.6k points
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