A car travelled 80% of the distance from town A to B by traveling at T hours at an average speed of V km/h. The car travels at an average speed of S km/h for the remaining part of the trip. Which of the following expressions represents the average speed for the entire trip?

A car travelled 80% of the distance from town A to B by traveling at T

1.	A car travelled 80% of the distance from town A to B by traveling at T hours at an average speed of V km/h. The car travels at an average speed of S km/h for the remaining part of the trip. Which of the following expressions represents the average speed for the entire trip?
A.	12VS/(9V+S)
B.	5VS/(4S+V)
C.	VT/3S
D.	9VS/(4S+V)
E.	None of these
Answer» C. VT/3S

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A car travelled 80% of the distance from town A to B by traveling at T hours at an average speed of V km/h. The car travels at an average speed of S km/h for the remaining part of the trip. Which of the following expressions represents the average speed for the entire trip?

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