Q$1$: Consider two computers, P$1$ and P$2,$ of the same instruction set $($ISA$).$ We have

a program of $7\mathrm{.}5{10}^9$ instructions and we want to run this program on P$1$ and P$2.$

The P$1$ computer is a $5GHz$ machine with CPI of $0\mathrm{.}8.$ The $P2$ computer is a $6GHz$

machine with CPI of $1\mathrm{.}2.$

$($a$)$ What is the CPU time of P$1$ computer to run this program?

$($b$)$ What is the CPU time of $P2$ computer to run this program?

$($c$)$ Which computer is faster?

$($d$)$ How many times that computer is faster than another?