Is this a valid way of thinking about the measurement problem?

Earlier today there was a highly upvoted post on r/theydidthemath that I believe involved a misunderstanding on the part of the people in the comments. I believe what they think is a simple math problem is actually an expression of the measurement problem.

It is centered around a tweet with this premise:

"A traveler must make a 60-mile round trip between two towns, A and B. The distance each way is 30 miles. Going from A to B, the traveler drives at exactly 30 miles per hour. By the time they reach B, they decide they want to average 60 miles per hour for the entire 60 mile journey.

Question: How fast must they drive on the return trip from B to A to achieve an overall average of 60 mph?"

This is such a perplexing problem, on a certain level.

If you write it a certain way it becomes very simple: If you travel 30 mph for 30 minutes and 90 mph for 30 minutes, then your average speed is very clearly 60mph.

This means that an average speed of 60mph is only possible during a journey that lasts for one hour. If you extend the duration of the journey, an average speed of 60 mph becomes impossible.

But 30 mph and 90 mph are both fixed rates. Them averaging out to 60 mph is dependent on one thing: Time intervals. Each rate must last for equal intervals of time relative to the other.

So for each unit of time spent at 30 mph, a unit of time must be spent at 90 mph. If this is achieved, an average speed of 60 mph must be reached.

And in the abovestated example, this is the case: 30 minutes are spent travelling at 30 mph. Then, 30 minutes (an identical time interval) is spent travelling at 90 mph. THAT is what gives us an average of 60 mph.

And in the example presented by the original post on r/theydidthemath, there is nothing to stop that from occurring. As long as an equal amount of time is spent travelling at 30 mph as is spent travelling at X rate on the way back, then there should be a clear answer to this problem.

It seems to me that the only reason there isn't is because it is essentially an expression of Xeno's paradox of the arrow, or the measurement problem.