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We know that the time traveled is 5 hours, since a car going 10 mph faster travels an extra 50 miles over the same amount of time.Dividing 300 miles by 5 hours, we get 60 mph. Since the car is traveling 10 mph, the car is traveling 70 mph.
90 mph = 220 yards in 5 seconds.
87.5mi/hr2
60 mph = 88 feet per secondThe car's average speed during that 5 seconds is 1/2 of (0 + 88) = 44 feet per second.The distance covered is (average speed) x (time) = 44 x 5 = 220 feet
Distance = Speed*Time = 70*5 = 350 miles.