A can complete a task in 12 days and B in 18 days. If they work together, how long will they take to complete the task?
Show answer & explanation
Correct answer: B
Explanation
Time taken by A = 12 days
Time taken by B = 18 days
According to the formula:
Total work rate = (1/A) + (1/B)
= 1/12 + 1/18
= (3 + 2)/36
= 5/36
Time = 36/5 = 7.2 days