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Effective access time to access a referenced word

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A computer has a cache, main memory, and a disk used for virtual memory. An access to the cache takes 10 ns. An access to the disk takes 10,000 ns. Suppose the cache hit ratio is 0.8 and the main memory hit ratio is 0.7. What is the effective access time in ns required to access a referenced word on this system?

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Solution Summary

Question does not specify main memory access time, so it is assumed as M ns in the calculations.

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Question does not specify main memory access time, so it is assumed as M ns in this solution. ...

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