Consider three different processors P1, P2, and P3 executing the same instruction set. P1 has a 3 GHz clock rate and a CPI of 1.5. P2 has a 2.5 GHz clock rate and a CPI of 1.0. P3 has a 4.0 GHz clock rate and has a CPI of 2.2.

We are trying to reduce the execution time by 20% for P1, but this leads to an increase of 30% in the CPI. What clock rate should we have to get this time reduction for P1?

(Please explain in detail ^^;)