Complete 23811

We ordered two parties of workers to replace the windows and doors. The first group would complete the task in 15 days. The second in ten days. How many days will they be able to exchange it together?

Correct answer:

t =  6 d

Step-by-step explanation:

t ·(1/15+1/10)=1

5t = 30

t = 30/5 = 6

t = 6

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