Answered

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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?

Sagot :

It will take them 7.5 hrs

walexp2002

Answer:

7.5

Step-by-step explanation:

9 + 6 =15hrs

15hrs/2 people

7.5

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