Two trains each travelling with a speed of 37.5 km/h are approaching each other on the same straight track . A bird that can fly at 60 km/h flies off from one train when they are 90 km apart . On reaching the other train it flies back to the first and so forth . What is the total distance travelled by the bird ?
What is the Factor-label set up to find the distance , in km , light travels in a year if its velocity is 3.0 x 10 8 m/sec ?