A bird is tossing (flying to and fro) between two cars moving towards each other on a straight road. One car has a speed of 18 km/h while the other has a speed of 27 km/h. The bird starts moving from the first car towards the other and is moving with the speed of 36 km/h and when the two cars were separated by 36 km. What is the total distance covered by the bird?

Hint: Apply the concept of relative motion.
Step 1: Find the time of meeting the car.
Given Speed of first car = 18 km/h
Speed of second car = 27 km/h

 Relative speed of each car w.r.t. each other
                             = 18 + 27 = 45km/h

Distance between the cars = 36 km

 Time of meeting the cars (t)= Distance between the cars  Relative speed of cars =3645=45h=0.8h

Step 2: Find the distance covered by the bird in time which is equal to the time of meeting the car.

 Speed of the bird (vb)=36km/h Distance covered by the bird =vb×t=36×0.8=28.8km