The train, moving at a speed of 40 km / h, covers the distance between the two cities in 4 hours. How many hours

The train, moving at a speed of 40 km / h, covers the distance between the two cities in 4 hours. How many hours will it take a car half of this distance if it moves at 80 km / h?

Remember the formula: S = Vt
Electric train.
V = 40km / h, t = 4h
S = 40 * 4 = 160 (km). is the distance between two cities.
Now, the car.
S = 1/2 * 160 = 80km, V = 80km / h, t =?
t = S / v
t = 80: 80 = 1 (hour)
Answer: the car will cover half the way in 1 hour.