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?