Marcie can walk 8 miles in the same time as Frank walks 6 mi

Marcie can walk 8 miles in the same time
as Frank walks 6 miles. If Marcie walks 1 mile per hour
faster than Frank, then how fast does each person walk?

Solution

st=d s=speed, t=time, d=distance
t=d/s
Let Marcie\'s speed=m
8/m=6/(m-1) since the times are equal.
8(m-1)=6m
8m-8=6m
2m=8
m=4 mph
3 mph Frank\'s speed.