If a car passes mile marker 50 in 2 hours and mile marker 200 in 6 hours how many miles per hour is the car traveleing? Solution: Speed = Distance / time Between the 2 markers, the distance is 200 - 50 = 150 miles. Between the 2 markers, the time taken is 6 - 2 = 4 hours. So the speed ismiles/hour. Hope this helps :)