Tesla Motors Club

I am seeking to make the transition to EV, and planning to order a Model S within a few weeks. I have read many of the threads on this forum which have been an invaluable source to learn about charging.

I am specifically interested in charging at vacation destinations where I may spend extend periods of time, and where a Supercharger would not be realistic, so please assume no access to Supercharger in this scenario. I will likely have easiest access to Tesla Destination Chargers (16kW) and ChargePoint (6 kW).

As I understand it kW determines the flow, and can be calculated by..
Volt x Amp = Watts

At home my electrician says my Tesla wall charger will..
1) 240 V x 60 Amp = 14.4 kW

Tesla Destination Level 2 chargers
2) 208 V x 80 Amp = 16.6 kW (listed on Tesla Site)

ChargePoint
3) Not sure, but listed as = 6 kW

In two of the scenarios above the onboard charger, which is 48 Amp / 11.5 kW, is the limiting factor. I have confirmed with Tesla that no upgrade is available (at least as a factory order).

My real question is how do I translate the kW to miles added per hour. I have read things on this forum such as "you can charge at 208 V * 48 A = 10 kW, or about 30 miles per hour of charging". Is there some simple conversion that I am missing that allows my to make this leap from 10 kW to 30 mph of charge, or in the examples above the 11.5 k limited by car or 6kW by ChargePoint to miles added per hour.

Thank you