Question 163598
Let x = amt of time driving to the computer store
then because "total travel time was 2 hours"
2-x = amt of time driving home
.
Using the distance formula of 
d = rt
where
d is distance
r is rate or speed
t is time
.
"distance driving to the store" = "distance going home"
15x = 35(2-x)
15x = 70 - 35x
50x = 70
x = 70/50
x = 7/5
x = 1.4 hours
or 1 hour and 24 minutes