An assembly line with 30 activities is to be balanced. The total amount of time to complete all 30 activities is 42 minutes. The longest activity takes 2.4 minutes and the shortest takes .3 minutes. The line will operate for 480 minutes per day In Problem 5, suppose the line is balanced using 10 workstations and a finished product (unit) can be produced every 4.2 minutes. a. What is the production rate in units per day? b. What is the assembly line efficiency?