Consider the following data for computer $C1$ :

$C1$ : clock rate $=2\mathrm{.}2GHz,$ running a benchmark program on $C1$ takes $20sec.$ A design team is developing a new computer $C2$ aiming the double performance by increasing the clock rate with the cost of increased clock cycles with the factor of $1\mathrm{.}4.$ What would be the clock rate of computer C$2?$