Answer :
lets train east x and west y:
xs=85 mil/h
ys=-65 mil/h
distance=270 miles
270mi/(20 mi/h)=t
time= 13.5 hr
xs=85 mil/h
ys=-65 mil/h
distance=270 miles
270mi/(20 mi/h)=t
time= 13.5 hr