Greg has just started a new job at a grocery store down the road. He lives within walking distance of it. It takes him 20 minutes to walk there. He lives \(\frac{2}{3}\) of a mile from the store. Sometimes he rides his bike there instead, and it takes him only half as much time to get there.

Greg wants to know his speed in MPH when he is walking and his speed in MPH when he is riding his bike.

Calculate the speed in each case and write your answer in the box given below.

Instructions: Write your answers with walking speed first, followed by the bike riding speed. Separate your answers by the word "and", for example, a and b.