A bird is sitting on top of a car. It sees another car approaching it at a distance of $240$ $\mathrm{km}$. The speed of the two cars is $60$ $\mathrm{kmph}$each. The bird starts flying from the first car and moves towards the second car, reaches the second car and comes back to the first car and so on, till the two cars crash. If the speed at which the bird flies is $120$ $\mathrm{kmph}$, then total distance travelled by the bird before the crash is: