Problema Solution
The office Jet printer can copy Marias dissertation in 10 min. The Laser jet printer can copy the same documents in 12 min If the two machines work together how long would they take to copy the dissertation?
Answer provided by our tutors
We assume time of working together is X min
We assume the whole work is 1, so the equation is
1/x = 1/10 + 1/12
We solve it
x = 60/11 = 5.45 min
So time of working together is 60/11 min