The read access times and the hit ratios for different caches in a memory hierarchy are as given below:

Cache	Read Access Time (In Nanosecond)	Hit Ratio
I-Cache	2	0.8
D-Cache	2	0.9
L2-Cache	8	0.9

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% od memory reads are for instruction fetch and 40% are for memory operand fetch. The average read access time in nanoseconds (up to 2 decimal places) is _________