Automobile traffic passes a point P on a road of width w feet with an average rate of R vehicles per second. Although the arrival of automobiles is irregular, traffic engineers have found that the average waiting time T until there is a gap in traffic of at least 1 seconds is approximately T = teRt seconds. A pedestrian walking at a speed of 3.3 ft/s requires t = s to cross the road. Therefore, the average time the pedestrian will have to wait before crossing is f(w, R)= () ew R/3.3 s What is the pedestrian's average waiting time if w = 24 ft and R = 0.2 vehicle per second?