Mark can wash 10 cars in 1 hour and 30 mins. What is the Mark's productivity? In hours? In Minutes? Suppose the average rate of washing cars is 8 per hour. What is Mark's efficiency? What is the efficiency of Alice who can wash 5 cars in 50 mins? Line A produces 5 phones in 30 mins. What is the line's productivity? In hours? In Minutes? Suppose the average rate of producing phones is 8 phones is 35 minutes. What is Line A 's efficiency? What is the efficiency of a Line B than produces 5 phones in 40 mins