Can someone help please Suppose that Santa will have his pic

Can someone help please!!

Suppose that Santa will have his picture taken with a child at a Poisson rate of 24 children per hour. You arrive with a child, and there are only 3 children ahead of you waiting to see Santa. What is the probability you will have to wait more than 8 minutes to meet santa? Can someone help please!!

P(1)= e^(-8*24/60)*(-8*24/60)^0/0!
P(2)=e^(-8*24/60)*(-8*24/60)^1/1!
P(3)=e^(-8*24/60)*(-8*24/60)^2/2!