Answer:
54 miles
Step-by-step explanation:
Given that Heather travelled at a constant rate, we can deduce that the more the time spend traveling, the more the distance in mile that Heather covers. As such the distance cover varies directly with time. let the distance be d and the time t, this may be expressed mathematically as
d ∝ t
d = kt where k is the constant of proportionality or the rate of travel
162 = k * 3
k = 162/3
= 54 miles per hour
It means Heather covers 54 miles in one hour
