Gone with the dogs
The writer Jack London had to go from Skagway to a remote camp in a sled pulled by 5 husky dogs. For 24 hours the dogs pulled the sled at full speed.
Then 2 dogs ran off with a pack of wolves, and the sled was slowed down proportionally. Jack reached camp 48 hours later than he planned. "If those 2 huskies had held on for 50 more miles, I would have been only half as late."
How far was the camp from Skagway and how long did it take Jack to get there?
So in other words 50 miles at full capacity is 24h faster than 50 miles at 0.6 capacity.
Therefore full capacity speed is 1.4 mph (ignoring the remainder)
Doing some sums, his original plan must have been 132 hours (5.5 days) at 1.4mph which is 184.8 miles
The actual journey took him 180 hours - 8.5 days.
Is that right? If not, why?