X does a work in 10 days and Y does the same work in 15 days. In how many days…
2017
X does a work in 10 days and Y does the same work in 15 days. In how many days they together will do the same work?
- A.
5 days
- B.
6 days
- C.
8 days
- D.
9 days
Attempted by 39 students.
Show answer & explanation
Correct answer: B
X's rate = 1/10 and Y's rate = 1/15. Together their rate = 1/10 + 1/15 = 1/6, so they finish the work in 6 days.