46 ) A firm is planning to set up an assembly line to assemble 40 units per hour , and 57 minutes per hour are productive . The time to perform each task and the tasks that precede each task are contained in the following table . Time to Preceding perform Task Task (min .) A .69 B A .55 C B .92 D B .59 E B .70 B 1.10 G C, D. E .75 I G. F .43 H .29 (a ) Draw a network diagram of precedence relationships (b) Compute the required cycle time per unit in minutes (c) Compute the theoretical minimum number of workstations required to produce 40 units per hour. (d) Balance this line using the longest processing time heuristic . (e) What is the efficiency of the line obtained in part d