Category: Mathematics | Last updated: 2026-09-18

A can do a piece of work in 20 days, B in 30 days, C in 60 days. Working together, they finish in:

A) 8 days

B) 10 days

C) 12 days

D) 15 days

Explanation

Rate = 1/20+1/30+1/60 = (3+2+1)/60 = 6/60 = 1/10. Time = 10 days.