"Dividing by the sum of speeds" doesn't always work: Automatically generating entrance exam problems for traveler's arithmetic and diagrams

This is the seventh installment in a series about automatically generating middle school entrance exam problems using Python ...

What is Altair? Why its declarative nature makes code concise and readable, and when to use it

IntroductionWhen drawing graphs in Python, it is common to use a step-by-step approach: setting axes, adjusting legends, ...