A, B and C complete a piece of work in 20, 9 and 12 days respectively. Working together, they will complete the same work inA1/24 daysB7/24 daysC4 1/11 daysD4 daysAnswer: C. 4 1/11 days Read Explanation: (A+B+C) will complete the same work in xyz / (xy + yz + xz) days ie; (20 * 9 * 12) / (180 + 108 +240) = (20 * 9 * 12) / 528 = 4 1/11 daysRead more in App