Problema Solution
a new photocopier works 4 times as fast as an old one. when the machines work together, a university can produce all its staff manuals in 12 hr. find the time it would take each machine, working alone, to complete the job
Answer provided by our tutors
let 'x' represent the time it takes the new photocopier to complete the job when working alone, then '4x' represents the amount of time it takes the old photocopier to complete the job alone
1/12 = 1/x + 1/4x
solving for 'x' we have x=15
4*15 = 60
the old photocopier would require 60 hours
the new photocopier would require 15 hours