Question

In a 24-hour endurance race, a car makes 640 laps of a race track that is 6 km per lap. How far did the car travel in 24 hours? What was its average speed?

Answer 1

The distance traveled by a car

$$d=Nd_1\\ =640\times 6\rm\: km=3840\:\rm km$$

The average speed

$$v=\frac{d}{t}\\ =\frac{3840\:\rm km}{24\:\rm hr}=160\:\rm km/hr$$