One cleaning crew can clean a school in 6 hours. A second crew can clean the school in 9 hours. How long will it take if both crews work together to clean the school?

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asked Nov 25, 2022 118k views

17 votes

One cleaning crew can clean a school in 6 hours. A second crew can clean the school in 9

hours. How long will it take if both crews work together to clean the school?

Mathematics
high-school

Brian Flanagan asked

by Brian Flanagan

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2 Answers

8 votes

Answer:

7.5

Explanation:

9 + 6 =15hrs

15hrs/2 people

7.5

Leandro Ariel answered Nov 27, 2022

by Leandro Ariel

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6 votes

It will take them 7.5 hrs

Maxim Orlov answered Dec 1, 2022

by Maxim Orlov

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