It's 200K to Seattle? We'll, we're averaging 100 kph so we'll be there in a couple of hours.
Actually I think driving is one place where miles actually has a tiny advantage.
Suppose you're going 60 mph. That's a mile each minute, which is really easy to work with. Destination 13 miles away? That's 13 minutes. But if you're going 100 km/h and your destination is 20 km away, now you have to do more actual math: divide 100 [km/h] by 20 [km] to get 5 [1/h], then divide 60 [min/hr] by 5 [1/h] to get 12 [min].
It's not hard, but really nothing in this unit conversion stuff is.
Even at 70 or 75 mph, the 1 mile/minute rule can be adjusted a bit. 13 miles away? Well, that's a bit less than 13 minutes. You do still have to do some calculations to get a more accurate answer, but a rough estimate can be arrived at nearly immediately. And even 60 mph is reasonably common -- many non-interstate highways have a 55mph speed limit, as do most interstates in urban areas. Also even on the interstates, if are going 70 mph but stop for an average of 5 minutes each hour, you get a lot closer to 1 mi/min. (That comes out to 64.1 mph on average.)
OK, I am giving a bit of a strawman. 75mph is 120km/h, which is very nicely 2 km/min, so there you'd just divide the destination distance by 2. At 70mph, you'd divide by 2 then add in a fudge factor, just like I subtract a fudge factor.)
This is made possible of course by the coincidence that 60 mph happens to be in the ballpark of highway speeds and there are 60 minutes in an hour, not because of any actual unit conversions or anything.
(Actually know I wonder what you'd get if you took the average speed limit of the entire interstate system weighted by traffic amount.)