A water tank of 1000 liters capacity is connected to a tap, which can fill at the rate of of 20 liters per minute and water is let out at the same time at the rate of 6 liters per minute.After an hour the outlet is shut off.Find how long will it take now for the tank to become full?
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Expert's answer
2012-01-27T08:49:03-0500
During the first hour the water tank fills at the rate of 20 - 6 = 14 lites per minute.
After one hour 14 * 60 = 840 liters will be in the tank.
So, 1000 - 840 = 160 liters remain for filling.
Now the rate is 20 liter per minute.
Let's find the rest of the time: 160 / 20 = 8 minutes.
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