4. Kemi and her friend Zarwan meet up for lunch with a group of friends. Zarwan leaves shortly after Kemi and they walk on perpendicular streets. The distance between them, d (in km) with respect to time, t (in hours) is given by the equation: d(t) = 50t + 10t+1 (application) a. What is the average rate of change in the distance between Kemi and Zarwan between 0 and 3 hours? Round your answer to the nearest decimal place b. What is the instantaneous rate of change in the distance between Kemi and Zarwan at 2 hours? Use the difference quotient to determine your answer. Round your answer to 1 decimal place.