Suppose we have two implementations of the same instruction set

architecture $($ISA$).$ Machine A and B use the same compiler. For a same

given program:

Machine A has a clock cycle time of $40$ ns $.$ and a CPI of $1\mathrm{.}0$

Machine B has a clock cycle time of $10$ ns $.$ and a CPI of $2\mathrm{.}0$

Which machine is faster running this program, and by how much?