Comprehension Passage
Directions: Study the graph carefully and answer the questions given below it.
The following graph shows the time taken by different individuals to complete the work.
X is as efficient as Y and together they do the same work in as much time as A and B together. In how many days X can complete the work individually?
1
10 days
2
12 days
3
15 days
4
20 days
5
None of the above