Question

help :/
Two mathematicians take a morning coffee break each day. They arrive at the cafeteria independently, at random times between 9 AM and 10 Am, and stay exactly for M minutes. Find the value of M if the probability that either one arrives while the other is in the cafeteria is 40%.
i'm so bad w/ probability :o

Answer 1

i \(\small \textbf{think}\)it's the 40% of 60 minutes (the max time anyone of them can stay)