Question: 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?
Solution:
He works out for 1.5*60=90 minutes per class
So he burns 90*7=630 calories per class
That means he burns 630*3=1890 calories per week
Answer: 1890