Kerri drives 150 miles to visit her grandmother. She starts off driving at 60 miles per hour, but then encounters road construction and has to drive 20 miles per hour the rest of the way. If she spends the same amount of time at the faster speed as at the slower speed, then how many hours did her 150-mile trip take in total?
+37158 60 m/h * x hr + 20 m/h * x hr = 150 m
80x = 150
x=1.875 hr at each speed = 3.75 hours total = 3 hr 45 min total travel time
1.875(60) + 1.875 (20) = 150
