d=24kmte=(24−10)kmt=14kmtf=(24−15)kmt=9kmtse=14kmtx=24kmsf=9kmtx=24km⋅914se−sf=24km−24km⋅914=8.571km
d,e,f are the running speeds of the runners.
t is the running time of Dirk.
x is the running time of Edith.
s_e, s_f are the routes to x.
Foley will be 8.571 km behind when Edith finishes the race.
!