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.
After working for 10 days D is joined by X. If they complete the remaining work in 5 more days, in how many days can X alone complete the work?
1
5 days
2
10 days
3
15 days
4
20 days
5
None of the above