statistics question

Customers arrive at the Waffle Shop according to an approximate Poisson process at a mean rate of 6 per hour. Let Y denote the waiting time in minutes until the first two customers arrive. Hint: Be careful with the units. 1. How is Y distributed? 2. What is the probability density function of Y? 3. What is the probability that the Waffle Shop will have to wait more than 15 minutes for two customers to arrive? 4. What is the expected amount of time the Waffle Shop will have to wait for two customers to arrive? 5. What is the variance of the amount of time the Waffle Shop will have to wait for two customers to arrive