The efficiencies of A, B and C are in the ratio 2 ∶ 3 ∶ 4. They together can complete a piece of work in 24 hours. In how many hours B alone can complete 150% of that work?

The efficiencies of A, B and C are in the ratio 2 ∶ 3 ∶ 4. They to

1.	The efficiencies of A, B and C are in the ratio 2 ∶ 3 ∶ 4. They together can complete a piece of work in 24 hours. In how many hours B alone can complete 150% of that work?
A.	54
B.	108
C.	72
D.	90
Answer» C. 72