Trains Crossing Bridges: Problem2

Problem: 1. A train is crossing a 900 meter long bridge. In order to fully cross the bridge, the train takes 1 minute and 25 seconds to go by. If it goes on a 1800 meter long bridge, it takes 2 minutes and 40 seconds to go by. Find the length of the train.
2. A train crossing a 430 meter long bridge takes 30 seconds to go by. The same train crossing a 2180 meter long tunnel takes 50 seconds if you double the original speed. The train is _________ meters long.

Key: Set variables and find the equality

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