Minutes 7177

The tank holds 140 liters of water. The tank is filled with a tap in 5 minutes, and the drain is emptied in 7 minutes. How long will it take for the empty tank to fill if we open the faucet and drain?

Correct answer:

t =  17.5 min

Step-by-step explanation:

t1=5 min t2=7 min  t=1/t11/t21=1/51/71=235 min=17.5 min

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