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From: Phil <phil@anonymous.invalid>
Newsgroups: sci.lang,alt.usage.english
Subject: Re: OT: Converting miles/km
Date: Sun, 22 Sep 2024 14:43:47 +0100
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On 22/09/2024 11:19, Snidely wrote:
> 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
> 

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-- 
Phil B