Tony walks 3 miles at 3 miles per hour for 3/3=1 hour.
Tony also runs 10 miles at 5 miles per hour for 10/5=<<10/5=2>>2 hours.
Thus, each day he exercises for 1+2=<<3=3>>3 hours.
Over the course of one week, he exercises for 3*7=<<3*7=21>>21 hours.
#### 21