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Is this a trick question? Incase it is a serious question here is a serious answer. It will take 200 hours without stopping. This number doesn't take into consideration the time it will take to accelerate to 20MP, various stops that may be needed and time to come to a complete stop at the end.

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16y ago
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Q: How long will it take at 20MPH for 4000 miles in length?
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