Working separately, A and B can complete a work in 15 days and 18 days, respectively. If A starts the work and they work on alternate days, one on each day, then in how many days will the work be completed?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. .
Total work = LCM of 15 and 18 = 90
Efficiency of A = 90/15 = 6
Efficiency of B = 90/18 = 5
2 days work = 6 + 5 = 11
16 days work = 8 × 11 = 88
Remaining work = 90 - 88 = 2
Time required for remaining work = 2/6 = 1/3 days
Total time = days