Trains Crossing Bridges: Problem 1

Problem: A train is 450 meters long. It drives along a train track. Next to the train track, there is a belt of trees lined up, with a length of 3 meters between each tree. The first tree starts at the beginning of the train track. The train starts at the very first tree of the line and then finishes at the 101th tree. In all, it took exactly 5 minutes. What speed is the train driving at?

Key: Think about what you're finding, and then use the formula.

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