A train travels at an average of 100 miles per hour for 4.5 hours and then travels at a speed of 140 miles per hour for 2.5 hours. How far did the car travel in the entire 7 hours?
Jasleen covered a distance of 1560 miles between city P and city Q taking a total of 10 hours. If part of the distance was covered at 120 miles per hour speed and the balance at 160 miles per hour speed, how many hours did she travel at 120 miles per hour?