Hey guys, im not the greatest at probability but here is a puzzle which i cant get....any idea!:

"We have 2 indivduals who agree to meet at a location between NOON and 1 P.M. They also agree to wait for 15 minutes for the other to show up (after that they will leave).

If each of them selects the time of arrival at random, what probability is it that the meeting will actually happen?"