During the 3 PM to 5 PM Time Period, Cars

During the 3 PM to 5 PM time period, cars arrive at a bank's drive-through window at an average rate of 15 customers per hour. Assume that the time between arrivals follows the exponential distribution. What is the probability that a randomly selected customer will arrive less than 5 minutes after the previous customer?

A) 0.4246
B) 0.5477
C) 0.8831
D) 0.7135