Two trains, each having a speed of 30km/h, are headed at each other on the same

Question

Two trains, each having a speed of 30km/h, are headed at each other on the same straight track.  A bird that can fly 60km/h flies off the front of one train when they are 60km apart and heads directly to the other train.  On reaching the other train, the bird flies directly back to the first train, and so forth.  What is the total distance the bird travels before the trains collide?  I tried calculating the distance the bird flies in between the respective changes of direction, but came up with a different answer than what this site said.  I don't quite feel like the answer on here is quite correct because it seems excessively easy.  I just need a confirmation.

Explanation / Answer

Is the speed of the bird relative to the train or to theground?

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