A and B decide to meet between 1 pm and 2 pm on a given day. Whoever arrives first will not wait for the other for more than 15 minutes. What's the probability that they will meet that day, and why?
My grandson is 9 and has difficulty in school. He can solve a Rubik's Cube in 3 minutes. He got it 2 days ago. Is there a subject he should pursue?