This is one of the practice questions in my extension class,

Apologies if the title topic is wrong, I'm a bit confused on how to approach the question:

Two friends agree to meet in the town square between 1:00pm and 1:30pm. They agree that they will wait for 5 minutes after arriving. If the other person does not arrive during that five minutes, the first person will leave. What is the probability that they meet?

So far I'm thinking that the answer is something like

but I don't know how to find the number of actual outcomes or if this is even how to solve the question.

any help is much appreciated, thanks in advance.