A, B, and C can do a job in 10, 12, and 15 days, respectively. If they work together, how many days will they take to complete the job?
Q1. A, B, and C can do a job in 10, 12, and 15 days, respectively. If they work together, how many days will they take to complete the job?
Answer: 4 days
Explanation: A's 1 day work = 1 / 10, B's = 1 / 12, C's = 1 / 15.