b$)$ Computer A excutes the MIPS ISA and has a $3GhZ$ clock frequency, Compiter B executes the $86$ and has $a4GhZ$ clock frequercy. on aurage. Program exeute $2$ times as mary $86$ instruction thar MIPS instruction. For Program PI$,$ computer A has a CPI of $3$ and computer $B$ has a CPI of $4.$ Which computer is faster for PI$?$ What is the speedup?