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From: Phil <phil@anonymous.invalid>
Newsgroups: sci.lang,alt.usage.english
Subject: Re: OT: Converting miles/km
Date: Fri, 20 Sep 2024 11:40:44 +0100
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On 20/09/2024 11:10, Bertel Lund Hansen wrote:
> Helmut Richter wrote:
> 
>> And easier to remember than 1.609344. But when will you need such precision?
>> For instance, when you drive on German roads outside villages, you must
>> reduce your speed to 31.0685 mph whereas the rough rule 1 mi = 1.6 km would
>> have allowed you 31.2500 mph.
> 
> I haven't neede it, but just for fun I have calculated the Danish speed
> limits in miles. If you want round firgures, it's:
> 
>    	  50 km = 30 mi
>    	  80 km = 50 mi
>    	110 km = 70 mi (2 km too much)
>    	130 km = 80 mi
> 

I'm not sure how common this is, but the speedometer in my car has 
scales for both mph and km/h, so in principle I don't need to convert. 
In practice, though, I have the above table in my head, from the old 
days. It's easily remembered because the right-hand column corresponds 
to the usual preferred values for UK speed limits.

-- 
Phil B