Re: OT: Converting miles/km

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?
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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