Question

Assume that activity F has the following times: Early start time (ES) = 7 days Early...

Assume that activity F has the following times:

Early start time (ES) = 7 days

Early finish time (EF) = 13 days

Latest start time (LS) = 15 days

Latest finish time (LF) = 21 days

Which of the following statements is TRUE about activity F?

  1. Activity F takes 14 days to complete
  2. Activity F is on the critical path
  3. Activity F has 8 days of slack time
  4. Activity F is the first activity of the project
  5. None of the above are true

Assume that activity J has the following times:

Early start time (ES) = 6 days

Early finish time (EF) = 11 days

Latest start time (LS) = 9 days

Latest finish time (LF) = 14 days

If disaster strikes and activity J will take 20 days to complete rather than the original activity duration (assume that it started at the ES time), by how long will the completion of the project be delayed?           a. 12 days

                b. 5 days

                c. 20 days

                d. 3 days

A person is making three specialty cakes. Due to differences in cooking temperatures, only one cake can use the oven at a time (each requires 45 minutes in the oven). Further, assume that mixing the ingredients before baking requires 15 minutes for each of the cakes (they use different ingredients and have to be done separately). Once removed from the oven, a cake has to sit for 15 minutes before icing is applied (which also requires 15 mins). Assuming that it is possible to mix and/or ice a cake while another is in the oven, how long will it be before the last cake finished (i.e., has icing on it)?

                A .3 hours

                b. 2 hours and 30 minutes

                c. 3 hours and 45 minutes

                d. 4 hours

Business   Operations-Management   
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Homework Answers

Answer #1

Question 1: c. Activity F has 8 days of slack time

Slack time = LS - ES = 15 - 7 = 8 days

Question 2: a. 12 days

Duration of Activity J before disaster = EF - ES = 5 days

Duration of Activity J after disaster = 20 days

Delay in Activity J = Duration of Activity J after disaster - Duration of Activity J before disaster = 20 - 5 = 15 days

Slack = LS - ES = 3 days

Delay in project duration = Delay in Activity J - Slack = 12 days

Question 3: a. 3 hours

Throughput time = Sum of all task times = Time for mixing + baking + siting after baking + icing = 15 + 45 + 15 + 15 = 90 minutes

First Cake will be out after 90 minutes

Cycle time = Max (All task times) = Time for baking = 45 minutes

Second cake will be out after 90+45 = 135 minutes

Third cake will be out after 135+45 = 180 minutes

Total time to prepare 3 cakes = 180 minutes = 3 hours

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