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Topic: Mr. Speedy's Run (Read 346 times) |
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Fool
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Posts: 11
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Mr. Speedy's Run
« on: Nov 23rd, 2005, 1:35pm » |
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This is my first riddle posted. I heard it from a friend, so i dont know if its already been posted or not.
There is a mile-long track. Mr. Speedy runs the track once at 30 mph. What speed should he run the second lap at for an average of 60 mph?
No, it's not the obvious answer. 
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JocK
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Posts: 877
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Re: Mr. Speedy's Run
« Reply #1 on: Nov 23rd, 2005, 1:46pm » |
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on Nov 23rd, 2005, 1:35pm, Fool wrote:
No, it's not the obvious answer. |
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Well, you don't need to be an Einstein for that..
He runs the first lap at 1/30 hpm (hours per mile). To get an average over two rounds of 1/60 hpm, he should run the second lap at 0 hpm.
Wait a second, that's pretty quick.. maybe you do need an Einstein (if only to ask for permission...! 
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| « Last Edit: Nov 23rd, 2005, 1:48pm by JocK » |
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solving abstract problems is like sex: it may occasionally have some practical use, but that is not why we do it.
xy - y = x5 - y4 - y3 = 20; x>0, y>0.
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Fool
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Posts: 11
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Re: Mr. Speedy's Run
« Reply #2 on: Nov 23rd, 2005, 1:50pm » |
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That fast, huh? That was disappointing. 
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