Question 828439
4*65=260 miles distance Glenn traveled
(4-12/60)*70=266
266-260=6 miles 
Waymon would be 6 miles ahead of Glenn

another way
In those 12 minutes, Glenn has gone 12/60*65=1/5*65=13 miles.
Waymon gains 5 miles an hour 
5*(4-12/60)=5*3.8=19
19-13=6 miles