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**Basic Physics...?!?!**

Hey Everyone, I just started the course and the first problem I come to, so very confused me!! I don't need an answer just a basic response on exactly HOW I can approach this problem because I am just totally blown away by it :surprised .

Two trains, each having a speed of 30 km/hr 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 60 km apart and heads directly for 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?

Please help the lost and confused!!