Two trains, each having a speed of 28 km/h, are headed at each other on the same straight track. A bird that can fly 60 km/h flies off the front of one train when they are 66 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 before the trains collide?

The value is

Explanation:

From the question we are told that

The speed of each train is

The speed of the bird is

The distance between the trains is

Generally the time taken before the collision occurs is mathematically represented as

=>

=>

The total distance covered by the bird is mathematically represented as

=>  

=>  

come closer and become far apart and become steam/gas

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.