Network Diagram Duration Problem in time management

Question

I am practicing exam nowadays to get PMP exam using famous exam simulator but i found question i cannot determine how they draw the diagram table below :

& they draw it like the following :

my question is how the End have 2 duration & how i can calculate critical path??

Thanks in advance

Answer 1

Critical path follows the longest duration path, which is Start->Task 3->Task 5->End.

End appears twice in the table since it follows each of Tasks 2 and 5, which are independent branches. End appears only once in the graph, as the terminal state, as you would expect.