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From: Snidely <snidely.too@gmail.com>
Newsgroups: sci.lang,alt.usage.english
Subject: Re: OT: Converting miles/km
Date: Sun, 22 Sep 2024 03:19:42 -0700
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On Sunday, kami pointed out that ...
> On Sun, 22 Sep 2024 01:52:33 -0700, Snidely wrote:
>
>> Remember when kami bragged outrageously?  That was Sunday:
>>> On Thu, 19 Sep 2024 23:12:52 -0000 (UTC), Christian Weisgerber
>>> wrote:
>>> 
>>>> I'm sorry, I don't know where to post this.  I'm crossposting to
>>>> alt.usage.english, because statute miles as a unit mostly afflict
>>>> the English-speaking world.
>>>> 
>>>> So you want to convert between miles and kilometers.  The conversion
>>>> factor is... uh...  A 40-year-old calculator book provides a useful
>>>> tip:  Unless you're designing a space probe, you can use ln(5).
>>>> 
>>>> WHAT?
>>>> 
>>>> Yes, the natural logrithm of 5 approximates the conversion factor
>>>> between miles and kilometers; specifically one mile is about ln(5)
>>>> kilometers.  It's accurate to four digits.
>>>> 
>>>> If nothing else, it's faster to type on a calculator.
>>>> 
>>>> I think that's hysterical.
>>> 
>>> 
>>> simplest method is to multiply by 0.6
>> 
>> There's no humor in that.
>> 
>> -d
>
> an easier method would be, if the limit is 80 miles per hour,
> simply add half, which is 40 and then one tenth of that, which is
> 4 and multiply it by 2 which is 8, so 48 + 80 is 128 km/h
>
> similarly lets say 120 miles per hour, half 60, tenth times 2 is
> 12, so 72 + 120 = 192 km/h.

There's no humor in that.

-d

-- 
"It wasn't just a splash in the pan"
  -- lectricbikes.com