Given the following details for two processors.

Processor A

Processor B

Clock Rate

$2\mathrm{.}5$ GHz

$?$

Cycle Time

$0\mathrm{.}4$ nanoseconds

$0\mathrm{.}5$ nanoseconds

CPI

$5\mathrm{.}0$

$2\mathrm{.}0$

What is the Clock rate for Processor B