Poisson Process (Expected Waiting Time) w Tree Diagram

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Hi everyone so I have a quick question.

Say for example we have a supermarket in which customers arrive with an intensity of 10 per hour.

The supermarket has 3 aisles, A,B and C. The probability of a customer going going to each aisle is 0.6,0.3,0.1

Then we want to find out the expected waiting time for 2 customers to go to aisle A, how would I go about this?

Am I just doing P(X=2) = 1-P(X<=1) firstly or ?

Haven't done questions like this before !

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See I am trying to figure out how would I calculate it because it's a bit confusing for me in terms of how to go about it