a lot of people say- are u blake and i say i'm 20% black then they say no your not then i say then why do i have a dad that is 10% black.

When amy exercises in her fitness center for 1 hr she burns a total of 475 calories.if she burns 9 calories a minute jogging on the treadmill and then burns 6.5 calories a minute pedaling on the stationary bicycle how many minutes of the hour does she spend exercising on the bicycle?