Assume that a given systems main memory has an access time of 6.0 ns, and its cache

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Assume that a given system’s main memory has an access time of 6.0 ns, and its cache has an access time of 1.2 ns (five times as fast). What would the hit ratio need to be in order for the effective memory access time to be 1.5 ns (four times as fast as main memory)?

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