Re: OT: Converting miles/km

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