A, B, and C can complete a work in 12, 15, and 20 days, respectively. How many days will they take to complete the work if they work together?
Q1. A, B, and C can complete a work in 12, 15, and 20 days, respectively. How many days will they take to complete the work if they work together?
Answer: 5 days
Explanation: A's 1 day's work = 1 / 12, B's = 1 / 15, C's = 1 / 20.