Problema Solution
kopy kwik has 2 copiers one can copy a year end report in 20 min the ohterbcan copy the same document in 30 min how long would it take both machines working together to copy the report?
Answer provided by our tutors
There average time = (20+30)/2 = 25
So using two machines will lower avaerage time to half, so it would take 12.5 min to copy the report