【求助】可以幫我解題嗎

有人可以幫我解這一題嗎?

題目: Suppose that a single-chip microprocessor [I]P[/I] operation at a clock frequency of 50 MHz, is replaced by a new model [I]P'[/I], which has the same architecture as [I]P[/I] but has a clock frequency of 75MHz.

(a)If [I]P[/I] has a performance rating of [I]p[/I] MIPS for a particular benchmark program [I]Q[/I]. What is the corresponding MIPS rating [I]p'[/I] for [I]P'[/I]?

(b)[I]P[/I] takes 250 seconds to execcute [I]Q[/I] in a particular personal computer system [I]C[/I]. On replaceing [I]P[/I] by [I]P'[/I] in [I]C[/I], the execution time of [I]Q[/I] drops only to 220 seconds. Suggest possible reasons for this disappointing performance improvemnet.

小弟因為即將考研究所, 買了一本計算機組織; 但發覺似乎沒有直覺的解法,
故請教大家,

謝謝

題目：假設單片微處理器P操作50 MHZ,由一個新模型P替換, 哪些和P一樣,但有75MHz。
A.如果P有MIPS一個作業評定為一個特殊基準程式Q。對應的MIPS對p是什麼?
B.P需要250 秒對Q 在一個特殊個人電腦系統C 。 在釋放P由P 用C, Q 的執行時間下降只到220 秒。建議這缺失的表現提升 的可能的原因。
現在還會考這個嗎？
有點懷疑勒

會耶 去年才考的 而且總共佔三十分 @@

Two different compilers are being tested for a 500 MHz machine with three different classes of instructions: Class A, Class B, and Class C, which require one, two, and three cycles, respectively. Both compilers are used to produce code for a large piece of software.
The first compilers's code use 5 million Class A instructions, 1 million Class B instructions, and 1 million Class C instructions. The second compiler's code uses 10 million Class A instruction, 1 million Class B instruction, and 1 million Class C instructions.
(a) Which sequence will be faster according to MIPS?
(b) Which sequence will be faster according to execution time ?

又一題完看攏無的@@