Golfers arrive at the starter's booth of a public golf course at a rate of 8 per

Question:

Golfers arrive at the starter's booth of a public golf course at a rate of 8 per hour during the Monday-to-Friday midweek period. If a golfer has just arrived,
a. What is the probability that the next golfer will arrive within 15 minutes (0.25 hour)?
b. What is the probability that the next golfer will arrive within 3 minutes (0.05 hour)?
c. The actual arrival rate on Fridays is 15 per hour. What are your answers to (a) and (b) for Fridays?