A system has a memory access time of 50 ns and a cache access time of 2

Question:

A system has a memory access time of 50 ns and a cache access time of 2 ns. The instruction time is 4 ns (not counting memory access) and the average instruction requires 0.25 memory accesses. If the hit rate is 0.90, what is the average instruction time?

Fantastic news! We've Found the answer you've been seeking!