Three volunteers are cleaning a beach. Priya alone would take 10 days, Tenzin 15 days and Omar 30 days. How many days will the job take if all three work together?

Explanation

1. 01

   Rates per day: $\frac{1}{10}, \frac{1}{15}, \frac{1}{30}$.

2. 02

   With LCM 30: $\frac{3}{30} + \frac{2}{30} + \frac{1}{30} = \frac{6}{30} = \frac{1}{5}$.

3. 03

   All three together finish in 5 days.