A) give the vertex set.
(b) give the edge list

A) The total 6 vertices namely are: A, B , C , X , Y and Z

B)The total 6 edges  namely are: AX, BY , CZ , AZ , BC and XY.

Step-by-step explanation:

The Vertex : Vertex of any figure is defined as the point where two or more edges meet.

Here, the given figure has total 6 vertices .

They namely are: A, B , C , X , Y and Z

Edges: An edge is defined as a line segment between any two pair of given vertices.

Here, the given figure has total 6 edges .

They namely are: AX, BY , CZ , AZ , BC and XY.

he spend 5.1 minutes chatting with his friends

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5 1/10