Problem 3 (Problem 4.15 in the Book) The work content time for an appliance product on a manual production line = 90.4 min. The required production rate is 45 units/hr. Work units are attached to a moving overhead conveyor whose speed is 2.5 m/min. Repositioning time per cycle is 9 sec, uptime efficiency is 96%, and manning level is 1.4. Because of imperfect line balancing, the number of workers needed on the line will be 5% more than the number required for perfect balance. The workstations are arranged in one long straight line, and the length of each station is 3.6 m. Determine (a) balance efficiency, (b) total length of the line, and (c) elapsed time a unit spends on the line