PLEASE SOLVE IT FAST

15.35 Three models, A, B, and C, are to be assembled on a mixed-model line. Hourly production rates for the three models are: A, 15 units/hr, B, 10 units/hr, and C, 5 units/hr. The work ele- ments, element times, and precedence requirements are given in the following table. Assume E = 1.0, E, = 1.0, and M; = 1. (a) Construct the precedence diagram for each model and for all three models combined into one diagram. (b) Find the theoretical minimum number of workstations required to achieve the required production rate. (c) Use the Kilbridge and Wester method to solve the line balancing problem. (d) Determine the balance efficiency for the solution in (c). Chap. 15 / Manual Assembly Lines Preceded by Preceded by Tock Preceded by Element 1 2 3 4 5 6 0.6 min 0.5 min 0.9 min 1 1 TeBK 0.6 min 0.5 min 0.9 min 0.5 min 1 1 1 0.6 min 0.5 min 0.9 min 1 1 0.7 min 1.3 min WN 2 3 0.7 min 1.3 min 0.9 min AWN 2 3 4 0.6 min 0.7 min 1.3 min WN - 1 2 3 8 000 10 0.8 min 5 6,7,9 6,7 0.8 min 1.2 min 0.8 min 6.6 min 6, 7, 8 Twc 4.8 min 6.2 min