Answer
$ f_{B/A} = 0.0182 $
Work Step by Step
To calculate the time the system spends in configuration B to the time it spends in configuration A, we use the following equation.
$ f_{B/A} = \frac{W_B}{W_A}$
Taking $W_A $ and $W_B$ from (g) and (h)
$ f_{B/A} = \frac{1.65 \times 10^{57}}{9.05 \times 10^{58}}$
$ f_{B/A} = 0.0182 $
