If X & Y together can complete the work in 10 days, Y and Z can complete the work in 12 days, and Z & X can complete the work in 15 days, then X alone will complete the work in:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 24 days.
Calculations:
Now, we have
⇒ 2(X + Y + Z) = 15
⇒ X + Y + Z = 15/2
we get, X + Y + Z - (Y + Z) = 15/2 - 5
⇒ X = 5/2
Required number of days = 60 × 2/5 = 24 days