Floating floor

In the new building is considered a floating floor worker in each room. Thirty minutes lay 9 m2 of the floor. How long did three workers lay the floor in 4 rooms with a total area of 90 m2?

Correct answer:

x =  100 min

Step-by-step explanation:

r=30/9=3103.3333 min/m2  x=r 90/3=3.3333 90/3=100 min

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