A, B and C working alone can complete a work in 12, 15 and 20 days respectively. In how many days A, B and C together can complete 20 percent of the same work?
Show answer & explanation
Correct answer: A
Explanation
Given:
A = 12 days, B = 15 days, C = 20 days
According to the formula:
Work Rate = 1 / Time
Combined rate of A + B + C = 1/12 + 1/15 + 1/20
= (5 + 4 + 3)/60
= 12/60 = 1/5
20% of the work = 1/5
Time = (1/5) / (1/5) = 1 day