Calculation 3620

The mine foreman calculated that 2 pumps must be in operation for 17.5 hours to drain the tunnel. He wanted to speed up the emptying of the shaft and added 3 more identical pumps. How long will it take to empty the shaft? Please also show your calculation.

Correct answer:

t =  7 h

Step-by-step explanation:

t=17.5 2/(2+3)=7 h

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