A car covers a distance of 160 km between two cities in 4 h. What is the average speed of the car?

Distance = 160 km;
time = 4 h

$\text{Average Speed} = \dfrac{\text{Total distance travelled}}{\text{total time taken}} \\[1em] \text{Average Speed} = \dfrac{\text{160}}{\text{4}} = 40 \text{km h}^{-1}$

So, average speed of the car = 40 km h^-1.