Jakes family is moving to a new home. they packed 22 boxes in 1 5/6 hours. what is the average number of boxes they packed per hour?

Here we are going to cross multiply
22 boxes=15/6 hours
we can convert the hours into minutes so 15/6 hours=110 minutes
X boxes=1 hour
22x 60=110x X
X=1320/110
X=12
so they packed 12 boxes per hour

What the heck don’t understand