157.Running Off the Bridge
★★★puzzlesJane Street
You are standing one quarter of the way across a bridge when a train approaches the near end. Running either direction at full speed, you would reach the end of the bridge at exactly the same moment as the train. What is the ratio of the train's speed to yours?
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Write one equation for each escape direction, with the train's distance to the bridge as an unknown, then eliminate it.
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