One-twentieth 82239

Peter and Honzo decided to build the building as quickly as possible. They built one-twentieth of the building in ten minutes. After 20 minutes, three more friends joined. Everyone was building at the same pace. How many minutes did it take to build the structure?

Correct answer:

t =  76 min

Step-by-step explanation:

t1=10 2 20=400 min z=t120=40020=380 min  t=2+3z=2+3380=76 min

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