Q31,paper 2, j14. In a paged memory management algorithm, the hit ratio is 70%. If it takes 30 nanoseconds to search Translation Look-aside Buffer (TLB) and 100 nanoseconds (ns) to access memory, the effective memory access time is

(A) 91 ns

 (B) 69 ns

(C) 200 ns

 (D) 160 ns 

Answer D

Let total page =100.

Effective Access Time = (30+100)* .7 +( 30+100+100)*(1- .7)=91+69=160