Question: Consider? ?a? ?computer? ?system? ?that? ?has? ?cache,? ?main,? ?and? ?disk? ?memory? ?and? ?virtual? ?memory.? ?If? ?it take? ?1? ?ns? ?to? ?access? ?a? ?word? ?from? ?the?

Consider? ?a? ?computer? ?system? ?that? ?has? ?cache,? ?main,? ?and? ?disk? ?memory? ?and? ?virtual? ?memory.? ?If? ?it take? ?1? ?ns? ?to? ?access? ?a? ?word? ?from? ?the? ?cache,? ?10? ?ns? ?from? ?RAM? ?and? ?10? ?ms? ?from? ?disk,? ?what? ?is? ?the average? ?time? ?to? ?access? ?a? ?word? ?if? ?the? ?system? ?has? ?a? ?95%? ?cache? ?hit? ?rate,? ?a? ?99%? ?RAM? ?hit? ?rate?

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