question_answer 47)

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

Answer:

                  Relative speed of cars \[=18\,km/h+27\,km/h=45\,km/h\]                 Time taken by each car to meet each other,                 \[t\,=\,\frac{36\,\,km}{45\,\,km/h}\,\,=\,0.8\,h\]                 Distance travelled by bird in \[t(=0.8\,h)\]\[=36\times 0.8=28.8\,km\]