Annie and Alvie have agreed to meet between 5:00 P.M.

and 6:00 P.M. for dinner at a local health-food restaurant.

Let X
Annie’s arrival time and Y
Alvie’s arrival time.

Suppose X and Y are independent with each uniformly distributed on the interval [5, 6].

a. What is the joint pdf of X and Y?

b. What is the probability that they both arrive between 5:15 and 5:45?

c. If the first one to arrive will wait only 10 min before leaving to eat elsewhere, what is the probability that they have dinner at the health-food restaurant? [Hint: The event of interest is A
{(x, y):⏐x  y⏐  

1 6

}.]