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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?

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?
asked 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?

asked
User Brian Flanagan
by
8.7k points

2 Answers

8 votes

Answer:

7.5

Explanation:

9 + 6 =15hrs

15hrs/2 people

7.5

answered
User Leandro Ariel
by
8.5k points
6 votes

It will take them 7.5 hrs

answered
User Maxim Orlov
by
8.2k points
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