A program with $520$ M instructions is run on two different processors, CPU$1$ and

CPU$2$ with the following specifications:

CPU$1$ specifications: $4\mathrm{.}6$ GHz clock and a CPI of $1\mathrm{.}8$

CPU$2$ specifications: $5\mathrm{.}2$ GHz clock and a CPI of $1\mathrm{.}3$