Employees Arrive at a Cafeteria According to a Poisson Process

Multiple Choice

Employees arrive at a cafeteria according to a Poisson process at an average rate of 30 employees per hour.The probability that after one employee arrives, the next one will arrive at least 3 minutes later is _________.

A) 0.223
B) 0.202
C) 0.183
D) 0.162
E) 0.143