A and B together can complete a work in 15 days. If A, B and C working together can complete the same work in 10 days, then in how many days can C alone complete the same work?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 30.
A + B finish work in 15 days
1 day work of A + B = 1/15
A + B + C finish in 10 days
1 day work of A + B + C = 1/10
C’s 1 day work = 1/10 – 1/15 = (3–2)/30 = 1/30
C alone can do the work in 30 days