A tank normally fills in 6 hours, but because of a leak it takes 8 hours. How long would the leak take to empty the full tank?

Explanation

1. 01

   The leak's rate is the rate lost: $\frac{1}{6} - \frac{1}{8} = \frac{4 - 3}{24} = \frac{1}{24}$ of the tank an hour.

2. 02

   It empties the full tank in 24 hours.