Question 906491
They want TOTAL trip not one way.
60*t=70*(t+-15/60)
60*t=70*t+-1050/60
60*t=70*t+-1050/60
1050/60=70+60*t
1050/60=10*t
1.75=t
t=1.75 hours one way
1.50+*1.75=3.25 or 3 1/4 hours for the trip 
distance =60*1.75=105.0  miles
distance =70*1.5=105.0 miles