New PMP Question & Answers with explanation

Al and Veronica have agreed to put an end to the bickering about the project by settling their personal differences on the Go Kart track. In fact, they have made it a team-building activity by giving their team members a half-day off so that they can join in the race. Team-building activities accomplish the following:
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A project manager of a retail chain of hardware stores is in the process of generating the project schedule. After the project manager issues the project assignments, a team member approaches him to say that he has a two-week planned vacation right in the middle of a critical activity. What did the project manager fail to do?
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Which of the following best describes virtual teams?
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With the first major milestone around the corner, the project manager has decided to move all the active project team members to a war room. This is an example of:
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Which of the following best defines internal rate of return (IRR)?
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