Three taps fill a tank in 6, 8 and 24 hours. How long do they take together?

Explanation

1. 01

   $\frac{1}{6} + \frac{1}{8} + \frac{1}{24} = \frac{4 + 3 + 1}{24} = \frac{1}{3}$ of the tank an hour.

2. 02

   So 3 hours together.