I need to find the IPC(instructions per cycle) for each processor, the clock rate for p2 that reduces its execution time to that of p1 and the numbers of instructions for p2 that reduces its execution time to that of p3.
processor ____ clock rate__ no. inst._____time
p1_____________2ghz____20*10^9 _____7s
p2____________1.5 ghz____30*10^9____10s
p3_____________3ghz_____ 90*10^9_____9s

I do not need the answer.. just tell me how to approach to each problems.(my book did not arrive yet so have no clue).

Due to pipelining modern day processors can't be calculating with a simple equation!
Your teacher should already be familiar with this fact!