Problem $2$:

Our favorite program runs in $10$ seconds on computer $A,$ which has a $2GHz$ clock. We are trying to help a computer designer build a computer, B$,$ which will run this program in $6$ seconds. The designer has determined that a substantial increase in the clock rate is possible, but this increase will affect the rest of the CPU design, causing computer B to require $1\mathrm{.}2$ times as many clock cycles as computer A for this program. What clock rate should we tell the designer to target?