Easy Physics Problem!! HELP PLEASE?
Two trains, each having a speed of 22 km/h, are headed at each other on the same straight track. A bird that can fly 44 km/h flies off the front of one train when they are 44 km apart and heads directly for the other train. On reaching the other train it flies directly back to the first train, and so forth. (We have no idea why a bird would behave in this way.) What is the total distance the bird travels?
Comments
The trains are approaching each other at 22+22=44km/h (i.e. the velocity of one train relative to the other is 44km/h).
The trains are initially 44km apart, so they will meet (collide) after 1 hour.
The total distance the bird can fly in 1 hour (at 44km/h) is 44km.
So the total distance the bird travels is 44km.