A, B and C can independently complete the same task in 4, 6 and 12 days, respectively. In how many days will they be able to complete the same task if they work together?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 2
According to the question
Total work = LCM (4 ,6, 12) = 12 days
Efficiency ratio of A, B, C = (12/4): (12/6): (12/12) = 3: 2: 1
They work together to complete the task = Total work / total efficiency = 12/(3+ 2+1)
= 12/6 = 2 days