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I have a simple doubt, Given a question that says that memory access time is x and page fault service time is y. We apply

T = h*x + (1-h)*y

Here assuming single level pagetable I suppose x is the time for accessing the page table and getting the frame number and to access the frame it should take an extra access to so why in hit case it's x instead of 2x.

In this  question Arjun sir took in case of hit 3 access (2 level pagetable + 1 access for accessing frame I 0) why he considered here an extra access ? 

Reference : https://gateoverflow.in/85404/gate1990-7-b

 

Help me out here :(

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$1$ is for secondary memory access after accessing the page table.
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