Working on this:
Alice and Bob agree to meet in the Copper Kettle after their Saturday lectures. They arrive at times that are independent and uniformly distributed between 12:00 and 13:00. Each is prepared to wait s minutes before leaving. Find a minimal s such that the probability that they meet is at least 25%.
I honestly can't figure out how to approach this one... It seems super simple, but I just can't wrap my head around it right now. Any advice on how to start?