Question 972332
Time spent going up hill=x
time spent coming down =(6-x)

Distances are the same.  Velocity1 *time1=velocity2*time2

1.5x=4.5(6-x)
1.5x=27-4.5x
6x=27
x=4.5 hours

6-x=1.5 hours

distance 1 =4.5*1.5=6.75
distance 2= 1.5 *4.5=6.75
total 13.5 miles

* = multiply.  We use that because x is a variable and x x y is not clear, whereas x*y is