Can u pls exaplin the arithmetic mean of time inverse of total execution time (1/sec) arithmetic mean of rate harmonic mean of rate

\begin{tabular}{|l|c|c|c|c|c|c|} \hline & ComputerAtime(secs) & ComputerBtime(secs) & ComputerCtime(secs) & ComputerArate(MFLOPS) & ComputerBrate(MFLOPS) & ComputerCrate(MFLOPS) \\ \hline Program1(108FPops) & 2.0 & 1.0 & 0.75 & 50 & 100 & 133.33 \\ \hline Program2(108FPops) & 0.75 & 2.0 & 4.0 & 133.33 & 50 & \\ \hline Totalexeautiontime & 2.75 & 3.0 & 4.75 & & & \\ \hline Arithmeticmeanoftimes & 1.38 & 1.5 & 2.38 & & & \\ \hline Inverseoftotalexecutiontime(1/sec) & 0.36 & 0.33 & 0.21 & & & \\ \hline Arithmeticmeanofrates & & & & & & \\ \hline Harmonicmeanofrates & & & & & & \\ \hline \end{tabular}