2.13 Assume that a benchmark program executes in 480 seconds on a reference machine A. The same program executes on systems B, C, and D in 360, 540, and 210 seconds, respectively.

Show the speedup of each of the three systems under test relative to A.

Now show the relative speedup of the three systems. Comment on the three ways of comparing

machines (execution time, speedup, relative speedup).