Numerical problem on Access time in Cache memory
Here is the algorithm for a read operation:


Check if the cell is in the first-level cache.
If not, check if it is in the second-level cache.
If not, access it from main memory.


The data you are given allow you to calculate how much time each operation takes, and what is the probability that each of the steps is being taken. Using this, you can calculate the average time of a read operation.