Problema Solution
One printing machine works twice as fast as another. When both machines are used, they can print a magazine in 3 h. How many hours would each machine require to do the job alone?
Answer provided by our tutors
first priniting machine needs x hours and second needs 2x hours.
so,
1/x +1/2x = 3/2x
so, total hours 2x/3.
2x/3 = 3
x= 9/2 hours.
so, one machine needs 9/2 hours and second needs 9 hours.