mia drove her car at the rate of 60 mph from her home to los angeles. her mother made the same trip at the rate of 80 mph, and took her 1/2 hours less than it took mia to make the trip. how far is mia's home from los angeles ?
4D = 3D + 120 ------- Multiplying by LCD, 240
4D - 3D = 120
D, or distance = miles