[問題] 2題計算機概論

[pipibabe (pipi)]

1.
The execution time for one program is 100 ns,
and multiplication instruction takes 80% of the
execution time.If the new execution time is 25 ns,
how to improve the speed of multiplication instruction?
(A)2times (B)4times (C)8times (D)16 times (E)none of the above

2.One instruction cycle takes 40ns.Among them,
IF(10ns),DE(5ns),EXE(10ns),MEM(10ns),WB(5ns).
Assume 100 instruction,hoe many times is the speed of
pipelining method over traditional method?
(A)4.85 (B)2.85 (C)3.85 (D)3.95 (E)none of the above

請幫忙解題拜託了!
不知道要從何下手的兩題...
謝謝

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