Half-filled 7336

The water tank is filled with the first inflow in one hour and 10 minutes and the second in 60 minutes. How many minutes will the tank be half-filled with both inlets if the second outlet is opened 12 minutes later?

Correct answer:

t =  6 min

Step-by-step explanation:

t/10+(t12)/60=1/2  7t=42  t=742=6  t=6=6 min

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