Question 342208
office et printer does the job in 14 monites
so it does 1.14 of the job in 1 minute.
...
laser jet does the job in 16 minutes
so it does 1/16 of the job in 1 minute.
together they do 1/14  + 1/16 of the job in 1 minute
(14+16)/224 
30/224 
...
to complete the job they will take 224/30 minutes
7.46 minutes