Question 974092
distance=rate * time
time to appt=x
time home= x + (1/8)   units are hours.

distance equal

so 90*x=80(x+1/8)

90x=80x +10
10x=10
x =1 hour

Distance is 90 miles.  One hour at 90 mph, 1 1/8 hours at 80 mph.