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Since the tank can hold up to 10 gallons and there are currently 5 gallons left, that means 5 gallons have been drained from the tank.
Using the information provided, we can calculate that the rate at which the water drains is 5 gallons in 3 minutes. So, the rate of draining is 5/3 = 1.67 gallons per minute.
To find out how many more minutes it will take for the tank to drain completely, we can divide the remaining 5 gallons by the draining rate of 1.67 gallons per minute.
Therefore, it will take approximately 3 more minutes for the tank to completely drain.