Post a New Question

algebra

posted by on .

the officejet printer can copy maria's dissertation in 18 min. The laserjet printer can copy the same document in 22 min. If the two machines work together, how long would they take to copy the dissertation?

  • algebra - ,

    rate1= 1/18
    rate2=1/22

    combined reate= rate1+rate2=40/18*22

    combined rate= 1/9.9 min

    so,9.9 min

    LEt me show you another neat way.
    In in 22*18 min, one machine can do 18, the other 22.

    so rate= (18+22)/22*18

    dissertations= rate*time
    time= 1dissertation/rate= 22*18/40=9.9min

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question