A machine can complete a job in 6 hours, and another machine can complete the same job in 4 hours. How long will it take for both machines to complete the job working together?
A. 1 hour
B. 2 hours
C. 3 hours
D. 4 hours
Answer:B
A machine can complete a job in 6 hours, and another machine can complete the same job in 4 hours. How long will it take for both machines to complete the job working together?
A. 1 hour B. 2 hours C. 3 hours D. 4 hours