John takes 3 naps a week.  Each nap is 2 hours long.  In 70 days how many hours of naps does he take?
There are 70/7=<<70/7=10>>10 weeks in 70 days.
So he takes 10*3=<<10*3=30>>30 naps
That means he naps for 30*2=<<30*2=60>>60 hours
#### 60