In this (kinda messed up) question, you have to first figure out what the inputs are vs. the outputs.
Re-reading the exercise 5 times, I’ve come to the conclusion you’d be in a situation where someone would ask “How many words did James type after x minutes,” making the number of minutes he was typing the input and the number of words he typed the output.
So, since I’m reading the inputs to be “how many minutes he’s typed” and we know he typed 20 minutes, the domain would be the possible number of minutes someone could ask about his typing. This would be from 0 to 20, including 0 and 20, because we could ask how many words he typed before he started (0 minutes as an input) and how many words he typed at the end of his 20 minutes (meaning 20 minutes is a fair input to use too).
But I don’t like that question at all.
