SOLUTION: A and B are two taps which can fill a tank individually in 10 minutes and 20 minutes respectively. However, there is a leakage at the bottom which can empty a filled tank in 40 min

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Question 813520: A and B are two taps which can fill a tank individually in 10 minutes and 20 minutes respectively. However, there is a leakage at the bottom which can empty a filled tank in 40 minutes. If the tank is empty initially, how much time will both the taps take to fill the tank (leakage is still there) ?
Answer by josgarithmetic(39621) About Me  (Show Source):
You can put this solution on YOUR website!
The FILLING rate is the sum of all the rates for each flow route.

1, for the unit of one tank,
1%2F10%2B1%2F20-1%2F40=%284%2B2-1%29%2F40=5%2F50=highlight%281%2F8%29 tanks per minute.

The one tank will be filled in 8 minutes.