Drag each pair into a slot (or tap a pair, then a slot).
The routes
🥇
Gold
Four pairs of capital cities a day.
Drag each pair from the set into a slot: 1 = shortest, 4 = longest (as the crow flies). Drag a placed pair to another slot to swap, or back to the set (or tap its ✕) to take it out. You can also tap a pair, then a slot; with a keyboard: Space, then the slot number.
With all three placed, press Check. A pair in its right slot turns green and stays; the others go back to the set, marked with the slot they were wrong in. You have 3 tries.
Medals: 🥇 right on the 1st try · 🥈 2nd try · 🥉 3rd try.
Then see the distances and the routes on the map.
One go a day. You can leave and come back to finish it.