Question

a red car is traveling 15 miles per hour faster than a blue car. if the red car travels 180 miles in the time needed for the blue car to travel 144 miles, find speed of each car

Answer 1

Their distance differs by 15 miles for each hour of travel time. Thus, the travel time of interest is
.. (180 -144) miles/(15 miles/hour) = 2.4 hour

The red car's speed is 180 mi/(2.4 h) = 75 mi/h.
The blue car's speed is 144 mi/(2.4 h) = 60 mi/h.