GATE | GATE CS Mock 2018 | Set 2 | Question 37

The read access times and the hit ratios for different caches in a memory hierarchy are as given below: The read access time of main memory in 90 nanoseconds. Assume that the caches use the referred-word-first read policy and the writeback policy. Assume that all the caches are direct mapped caches. Assume that the dirty bit is always 0 for all the blocks in the caches. In execution of a program, 60% of memory reads are for instruction fetch and 40% are for memory operand fetch. What is total value of average data fetch time multiplied by average instruction fetch time?