<span>The distance between two cities is ninety miles, and a woman drives from one city to the other at a rate of 45 mph. At what rate must she return if the total travel time is three hours and forty minutes?
1st leg DATA: distance = 90 mi ; rate = 45 mph ; time = d/r = 2 hrs. </span><span>2nd leg DATA: distance = 90 mi ; time = [3 2/3 - 2] = 1 2/3 hrs; rate = 90/(5/3) = 54 mph Ans: 54 mph</span>
