The following two problems are related to the Amdahl's law:
a) Write down the formula for Amdahl's law.
b) Suppose that an original sequential program is rewritten into a sequential component and a parallel component that is equal in execution time. After speedup, the program runs for 6 seconds. If we know the parallel part is running on 5 cores after the code modification (hence the speedup is 5). What is the original execution time of the sequential program?