Suppose we have a 3 level memory hierarchy with following specs,
level1 - 4 words per block, 4 blocks, the access time of 10ns/word.
level2 - 16 words per block, 8 blocks, the access time of 20 ns/word.
level3 - 32 words per block, 16 blocks, the access time of 400ns/word.
when there is a miss in l1, it goes to l2 and when miss in l2 , it goes to l3, then a word will be read from level1. What is average access time for the above transfer?