32. The figure below represents a certain race along a straight course. The race started at S and finished at F. A certain runner participating in this race clocked elapsed times t_A, t_B, t_C, t_D, and t_F minutes from S to points A, B, C, D, and F, respectively. If BC, for example, denotes the distance between points B and C, and all distances are measured in kilometers, which of the following expressions necessarily represents the runner's average speed for this race, in kilometers per minute?

F.

G.

H.

J.

K.