perform the calculation

Question 1 1/1 pts Two drivers are traveling along a downhill roadway with a grade of 2.5%. One driver, an elderly individual, is traveling at 55-mph and the other driver, a teenager, is traveling at 70-mph. If the teenager exhibits a normal PIEV time of 2.5 seconds and the elderly driver has twice as much a PIEV time, how much distance will the elderly driver cover while perceiving/reacting to the need to stop? Assume a = 11.2 ft/s2. (In feet; do not include units.) Between 711.75 and 721.75