Question 1186709
A car goes from station A to station B with speed v1, and returns from B to A with speed v2. Station A is a distance d from station B.
a.	Determine the total time t,  for the trip. (Express your answer in terms of v1, v2 and d)
Avg speed for the trip is 2*v1*v2/(v1+v2)
t = 2d/Avg speed.
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b.	What is the total distance traveled for the entire trip? (Express your answers in terms of d)
Get serious.
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c.	What is the displacement for the entire trip?
Zero.
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d.	What is the average speed of the car for the entire trip? (Express your answer in terms of v1 and v2 only) 
See (a).
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e.	What is the average velocity of the car for the entire trip?
See (a) for avg speed.