A can finish a work in 20 days. A and B can together finish a work in 12 days.Then B alone can finish the work in
A24 days
B28 days
C25 days
D30 days
Answer:
D. 30 days
Read Explanation:
Total work = lcm[ 20, 12] = 60
A's efficiency = 60/20 = 3
A + B's efficiency = 60/12 = 5
B's efficiency = 5 - 3 = 2
Time taken by B alone to complete the work = Total work / B's efficiency
= 60/2
= 30 days