Problem
From a word problem:
A car drives 20km with a relative uncertainty of 5%. The time elapsed is measured with an uncertainty of 2%.
What is the relative uncertainty of the average velocity?
Thoughts
If the time elapsed had a given value of, say, 600 seconds, then I feel like calculating
$$v = \frac st = \frac{20,000m \ \pm \ 1000m}{600 \ \text{sec} \ \pm \ \frac{2}{100}600 \ \text{sec}}$$
would have yielded a $[\min(v), \ \max(v)]$ interval that I could have used to calculate the compound uncertainty.
But with the time elapsed being unknown, I'm not sure how to solve this.
Does one even need to consider the values in the question, besides just the percentages?