James takes a spinning class 3 times a week.  He works out for 1.5 hours each class and burns 7 calories per minute.  How many calories does he burn per week?
He works out for 1.5*60=<T>multiply(1.5, 60)=90.0 minutes per class
So he burns 90*7=<T>multiply(90, 7)=630 calories per class
That means he burns 630*3=<T>multiply(630, 3)=1890 calories per week
