Mental arithmetic in the hills part 2: km/h on Broad Cairn

We climbed Broad Cairn on Deeside and used the Queen's Land Rover track. I've been trying to learn km. I was successful in transferring from feet to metres a decade ago. But I still think of distances in miles. I know that we tend to average 1 mph over high mountains. But we had the chance to come back down vehicular access to a high hunting lodge. 4 km of track. Could we do it in 1 hour? So that is is 1 km in 15 minutes. 60 metres per minute would be 600m + 300m = 900m in 15 minutes. So roughly 1 metre per second. That's one big stride every second. Well, we did it. So I now have more of an idea about distances and speeds.