Question 910745
x*136/60=d,
(x-3.5)*3=d
x*136/60=(x-3.5)*3
x*136/60=3x-10.5
x*136/6=30x-105
x*136=180x-630
630=44x
315=22x
315/22=x
x=14.32  mph downhill
x-3.5=10.82 mph  uphill