A cross country skier moves from location A to location B to location C to location D. Each leg the back and forth motion takes 1 minute to complete; the total time is 3 minutes. (The unit is meters.) A. What was the average speed of the skier during the three minutes of skiing?

B. What was the average velocity of the skier during the three minutes of skiing?

C. What was the speed of the skier during the second minute of skiing (from 1 min to 2 min)?

D. What was the velocity of the skier during the third minute (from 2 min to 3 min)?