Aarav can tile a kitchen floor in 20 days and Gurpreet can tile the same floor in 30 days. If they work together, in how many days will the floor be tiled?

Explanation

1. 01

   Aarav's rate = $\frac{1}{20}$ of the floor per day; Gurpreet's = $\frac{1}{30}$.

2. 02

   Together: $\frac{1}{20} + \frac{1}{30} = \frac{3 + 2}{60} = \frac{1}{12}$ per day.

3. 03

   So they need 12 days.