Is cancellation a technique to reduce fractions to the lowest terms?

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?

Can someone, me with this.i really need with this

Which of the following is the sum of 3 1/6 + 6 3/8?