How long should it take for a car going 80 mph to go 40 miles
It would take a car 30 minutes to travel 40 miles going 80 miles per hour. The formula to calculate the answer is d=rt, where d = distances, r = rate (or speed), and t = time. In this word problem, you would substitute in as follows: 40 miles = 80mpht. Then you solve for t. Divide both sides of the equation by 80mph to arrive at 40 miles/80mph = t. Thus t = 1/2hour, which is equivalent to 30 minutes.