A can do 50% more work as B can do in the same time. B alone can do a piece of work in 20 hours. A, with help of B, can finish the same work in how many hours ?



[ A ]    12
[ B ]    8 right
[ C ]    13$1 \over 3$
[ D ]    5$1 \over 2$
[ E ]    47$1 \over 2$
Answer : Option B
Explanation :