Two car start from place A and B 100 km apart, towards each other. Both cars start simultaneously. A bird sitting on one car starts at the same time towards the other car and as soon as it reaches the second car. It flies back to the first car and it continues in this manner flying backwards and forwards from one car to other, until the car meet. Both cars travel at a speed on 50 kmph and the bird flies at 100 kmph. Total distance covered by the bird will be.