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Brainteaser #25- Collision Course -

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Puzzle Image Two missiles are heading towards each other on a collision course. One missile is traveling at 9,000 miles per hour and the other is traveling at 21,000 miles per hour. They are 1,317 miles apart at the moment. Without using pencil and paper, can you calculate how far apart the two missiles will be exactly one minute before they collide?
Do you have a suggestion for this puzzle (e.g. something that should be mentioned/clarified in the question or solution, bug, typo, etc.)?