Question

Machine X is 100% more efficient than Machine Y, and Machine Y is 75% more efficient than Machine Z. Machines X and Z, working together, can complete a certain task in 15 days. How many days will it take for Machines Y and Z, working together, to complete twice the amount of work, if Machine Z operates at only half of its normal efficiency?  

A (540/11) days
B 36 days
C 60 days
D (270/11) days
E 90 days
Practice Next

More Time and work Questions

Relevant for Exams:

Hey! Ask a query