A and B complete the work in 12 and 15 days, respectively. They started the work alternately for 1 day each, and A started the work first. In how much time will 60% of the work be completed?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 8 days.
LCM(12, and 15) = 60
The efficiency of A = 60/12 = 5 units
The efficiency of B = 60/15 = 4 units
60% of 60 = 36 units
2 days work = 9 units )× 4
8 days = 36 units