# Relative speed of objects

This question has been bugging me for a while now. I am not sure this is the correct forum to ask, please close if it is not the right forum.

Lets say a bus is traveling at $60\: \mathrm{km/h}$ and there is a mosquito flying inside the bus. Since the mosquito's speed is considerably less than that of the bus why it wouldn't end up hitting the back side of the bus?