A, B, and C can do a work in 10, 15, and 20 days. They work together for 2 days, then A leaves. How many more days will B and C take?
Q1. A, B, and C can do a work in 10, 15, and 20 days. They work together for 2 days, then A leaves. How many more days will B and C take?
Answer: 6 days
Explanation: Work done by A, B, C in 1 day = 1/10 + 1/15 + 1/20 = 13/60. Work done in 2 days = 2 * 13/60 = 26/60. Remaining work = 1 - 26/60 = 34/60. B and C's rate = 1/15 + 1/20 = 7/60.