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Journal of No. 118


July 23rd, 2012

courtesy Julius Sumner Miller @ 06:30 pm

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A man goes from A to B (which is any distance you please) uniformly at 30 miles per hour. ... At what rate must he return from B to A in order to average 60 miles per hour for the total journey?
 
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From:Donovan K. Loucks
Date:July 23rd, 2012 11:53 pm (UTC)
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Wow. That's amazing. The intuitive answer is 90 miles per hour. But I find the truth isn't as intuitive as we'd like it to be.
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From:johnny9fingers
Date:July 24th, 2012 03:07 am (UTC)
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If he travels 60 miles, it takes 2 hours at average 30mph. To return the 60 miles and average 60mph for both journeys would mean he needed to do it in no time at all.

Excellent. He'll need to book a Tardis for the return journey then.
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From:ladyeuthanasia
Date:July 24th, 2012 11:18 pm (UTC)
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I am feeling mathematically inferior.

Journal of No. 118