5. Consider a computer system that has cache memory, main memory (RAM), and disk, and the operating systems uses virtual memory. I takes 2 nsec to access a word from the cache, 10 nsec to access a word from RAM, and 10 ms to access a word from the disk. If the cache hit rate is 95% and main memory hit rate (after a cache miss) is 99%, what is the average time to access a word