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your theory is a very common one, and is true to the original theory;
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I think that she was referring to Professor Branestawm's theory that if you can travel from point A to B in ten minutes by going at 50kph, then going 100kph will get you there in five minutes. Eventually, if you speed up enough, you'll get there more or less the same time as you left and if you go any faster than that you'll get there earlier. Of course, that would involve going faster than the speed of light, so you'd be a body of inifinite mass.
Just like your mum
I used to believe that theory myself for an embarrassingly long time. I always figured that Einstein was just making it up as he went along and clearly hadn't read the Branestawm books.