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There are 20 bored people on a 5 mile road. They each travel one way or...

There are 20 bored people on a 5 mile road. They each travel one way or the other
at the constant speed of 5 miles per hour. Whenever two people meet, they each turn around
instantly and walk in the opposite direction at the same speed. How long, at most, will it take
before there is no one left on the road?

Science   Advanced-Physics   
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