Question 4635
susan's rate = 50
susan's time = 3.35 hours
susan's distance = d

rate*time=distance
(50)*(3.35)=d
167.5 = d

She drove 167.5 miles.

If she drives at 45 mph:
rate * time = distance
45 * time = 167.5
divide both sides by 45:
time = 3.72 hours

this makes sense because it should take her longer to drive at a slower rate.