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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 offi…

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 offi…
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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

asked
User Tobias Baaz
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8.6k points

2 Answers

3 votes
10 minutes is the answer

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