There is a total of 100 calories in 15 of Mei's favorite crackers. What is the total number of calories in 60 of Mei's favorite crackers?

Solve the problem by making up an equation. a man could arrive on time for an appointment if he drove the car at 40 mph; however, since he left the house 15 minutes late, he drove the car at 50 mph and arrive 3 minutes early for the appointment. how far from his house was his appointment?