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The access times of the main memory and the Cache memory, in a computer system, are 500 n sec and 50 nsec, respectively.
It is estimated that 80% of the main memory request are for read the rest for write. The hit ratio for the read access only is 0.9 and a
write-through policy (where both main and cache memories are updated simultaneously) is used. Determine the average time of the
main memory (in ns).
How do we know that Cache memory uses HIERARCHICAL ACCESS or SIMULTANEOUS ACCESS? My primary doubt that can we
solve this using simultaneous access. I know how to solve this kindly rectify my doubt. [GATE 1992: Q5(a)]


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