PMRoad Trip Questions -- Trouble with some of the solutions..

Hi, I took the practice test from PM Road Trip and had some trouble with the following questions below. I do not see how the solutions are correct. I have posted the question number andI posted the specific question I had regarding the question/solution. If anyone can talk through the solution of some or all I would appreciate it. Thanks!

PMRoad Trip Questions

#23 -Question talks about project A being selected. It is not in the list so I assume all projects listed would be summed to determine opportunity cost..

#60 Can change be requested  ( that effect the scope baseline ) after deliverable acceptance and be approved for the current project?

#90 - Was not able to get the solution listed for the three point estimate

#136 -- Solution talks about lead time..

#174 Not sure how to solve this.  Where does the Target Cost come from?

Thanks for the help.

Question 23:  I agree that this is a Poorly edited question as the project names in the Q are not having consistent notation.  Any way, concept wise: Opportunity Cost is the second best you gave up inorder to proceed with the Best.  Do not add.  If you choose a project whose value is $55,000 and the next best project's value is $40,000 - your opportunity cost is: $40,000.00 Forget about answer choices given.  Stick 2 the concept.  PMP exam question & answer choices will be thoroughly scrutized and you will not face this kind of inconsistency in question wording/notation etc.  


Thanks Chandra

I think I understand fully. In order for Opportunity cost to be valid in a question, you must be able to know the “second best” to your selection.  


Deliverables accepted but no where mentioned that the Project is closed.  If it is closed already, Option C: Work with the customer to initiate a new project' is the only way whether minor or major as the resources were all released.  Assuming that the project is not closed, the next best thing after deliverables are accepted is : Option B - to initiate a contract change request, assess the cost, time, scope impacts, get it approved by the CCB & customer and proceed. 

Option A : ruled out as you already fulfilled contract scope

Option D ruled out as you can't schedule unless it is approved in the first place.



Hi Chandra,

So this appears to be another unclear question.

I guess my real question is, can the Scope Statement or baseline be changed once approved? And does this necessarily mean a contract change?  I was thinking for this question, this would be a change request if the customer is requesting adding to the scope ( which result in  new baselines  ). This was assuming the project is not closed.

Any thoughts?


You are correct.  Again a poor answer choices.  Typically 3 point estimate uses PERT formula: (O+4M+P)/6 and in this case (7+4*13+15)/6 = 12.33 - not given. 

Note If the wording is ' Triangular distribution' then the average of all 3 would be correct (7+13+15)/3 = 11.67 - option C would be correct but here that is not mentioned and not applicable.

Again - not every practice test you see on the web is written by an author of high standards.  Just ignore.  Having seen 2 such q's - you better avoid this free (sub standard) test altogether



Thanks for the feedback. At the very least, these questions like this force me into more research and understanding.

I will go with option A - Lag time was applied to activity D. 

Lead means you are adding some more time to the schedule activity and allow it to start later than you plan.  You do this either by compulsion (e.g.  you have to allow some time for the concrete to settle down after pouring and then only you can proceed further) or you have enough flexibility/provide deliberate cushion time to account for unexpect delays in deliverables etc.

Lag means you are subtracting and w/o waiting for activity C to complete you started D early

Crashing - ruled out as you did not allocate more resources to either C or D

Fast Tracking - ruled out as you did not start C & D simultaneously.  You started D while C was in progress

Option B - ruled out as you are not subtracting any time from activity C's starting time





Hi Chandra,

I am still a little confused.  

Per the PMBOK ( pg 140 ):

Lead: "allows acceleration of the successor activity" Which I would think you are adding negative time to allow the activities be performed in parallel

Lag: "directs a delay in the activity" Which I would think you are delaying the activity.

I am thinking this is another error in the  test.

Thank you for your feedback on this.

I don't see any error either in the test or the definition on Pg 140 at PMBOK4.0

Here you left activity C untouched.  You did not start it earlier or did not finish it earlier.  It is going as planned.  What you did is: without waiting for C to complete, you started the successor activity D i.e. you subtracted some amount of time, say 5 days, from its starting date and instead of starting on 20th, you started it on 15th.

You can find the best explanation by downloading free " Critical Path Drill" from Head First PMP website


Option D is the correct answer.

PTA  =((Ceiling Price - Target Price)/buyer's Share Ratio) + Target Cost

       = (100,000-90,000)/0.75  + 80,000




Thanks Chandra. I understand now.

Since the changes requested by the customer are termed ; minor', I assume the impact on the 3 constraints: time, cost and scope is also minor but since contract obligations are already met, the best way to accommodate the customer is to intiate a contract change request and let it go through proper channel and make the changes accordingly upon approval