A new photocopier works 4 times as fast as an old one. When the machines work together, a university can produce all its staff m
anuals in 28 hours. Find the time it would take each machine, working online, to complete the job.
1 answer:
The old photocopier can make x manuals in an hour. The new photocopier can make 4x. Combined, they made 5x manuals in an hour.
In one hour they can make 1/28 of the manuals.
1/(28*5)=1/140 is the rate.
The new photocopier can make all the manuals in 4/140 or 35 hours.
The old one can make them in 140 hours.
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