The Officejet printer can copy Maria's dissertation in 10 minutes. The Laserjet printer can copy the same document in 14 minutes. If the two machines work together, how long would they take to copy the dissertation?

Question

The Officejet printer can copy Maria's dissertation in 10 minutes.  The Laserjet printer can copy the same document in 14 minutes.  If the two machines work together, how long would they take to copy the dissertation?

anonymous · Answer

$$\frac{10\times 14}{10+14}$$

anonymous · Answer

5.8 minutes?

anonymous · Answer

well as a rounded decimal. it is actually 
$$5\tfrac{5}{6}$$

anonymous · Answer

and since it is time we are looking for, i would say 5 minutes and 50 seconds

anonymous · Answer

Yes, you are right...I forgot it has to be a fraction.  thanks.