A and B working separately can do a piece of work in 10 days and 15 days respectively. If they work on alternate days beginning with A, in how many days will the work be completed ?
A12
B10
C9
D6
Answer:
A. 12
Read Explanation:
total work = LCM(10,15) = 30
work done by A in one day = 1/10
work done by A in one day = 1/15
work done by A + B in 2 days = 1/10 + 1/15 = 1/6
work done by A + B in one day = 1/12
Time taken by A and B to complete the work = 12 days