Four trucks are waiting on a loading dock with one bay The trucks are labeled in

Question

Four trucks are waiting on a loading dock with one bay The trucks are labeled in the order that they arrived at the dock. The times required to unload each truck and the times that the goods they contain are due in the plan are given in the table It is currently 1:00 pm. Unloading time (minutes) 20 14 35 10 Time Material is Due 1 25 1 45 1.50 1.30 Truck (30 Paints) a) Determine the unloading sequence using the shortest processing time dispotching rule and its associated maximum lateness Total79 Sequence Maximum lateness b) Determine the unloading sequence that minimizes the mean flow time and its associated maximum lateness Maximum lateness . Determine the unloading sequence that minimizes the maximum lateness and its associated maximum lateness c) Answer Sequence Maximum lateness

Explanation / Answer

1. Sequence for SPT

D-B-A-C with completion time D- 1:10, B- 1:24, A- 1:44 and C- 2:19

Lateness - D=0, B=0, A-19 C-29

Max lateness -29

2.It will again be DBAC as in question 1, with minimum avg flow time of 39.25, maximum lateness 29.

3 The best possibility for minimising the lateness is A-D-B-C, with only activity C being late by 29 min. Total lateness bring 29 min.

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