Thread: Riddles!
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Unread 10 Mar 2009, 13:38   #38
Mzyxptlk
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Re: Riddles!
Quote:
Originally Posted by RuBBeR View Post
why isn't it (120 x 2 -60 = 180) ???
If the track is 360km, then he spent 6h going 60km/h. If you drive the second lap at 180km/h, then that lap takes another 2h, giving you an average speed of (360km+360km)/(6h+2h) = 720km/8h = 90km/h

To double your average speed, you need to drive 720km in 6 hours. Since you've already spent 6 hours driving 360km, there is no way you're realistically going to manage that, as you'd need to drive the remaining 360km instantly, at infinite speed.

I'm not sure if relativity aids your efforts or works against them, you'd need someone with more knowledge of modern physics to answer that. In any case, there is no vehicle on earth that can pull it off.
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