EAT$=CHR$ Cache access time $+(1-CHR)$ Memory access time

EAT for a byte from the main memory $=0\mathrm{.}982ns+0\mathrm{.}021s=21\mathrm{.}96ns$

Effective Access Time $($EAT$)$ for a byte from the hard disk is calculated as:

Effective Access Time $($EAT$)=$ MHR EAT from main memory $+(1-$ MHR$)$ HDD access time

Effective Access Time $($EAT$)=0\mathrm{.}9521\mathrm{.}96ns+0\mathrm{.}0520ms$~~$1\mathrm{.}000020862ms$~~$1ms$

Since a $32-$bit word is equivalent to $4$ bytes:

Access time for a $32-$bit word ~~$4ms$