A car travels from point A to point B. The average speed of the car is 60 km/hr and it travels the first half of the trip at a speed of 45 km/hr. What is the speed of the car in the second half of the trip? Choose the correct choice from the following answers.
A) 75	B) 80	C) 90	D) 95	E) 100
Let D be the distance and let V be the speed in the second half.   The total time = T1 + T2   D/60 = D/90 + (D/2) / V   D/180 = D/2V and so V = 90 km/hr   The answer is 90.
<result>C</result>
A car travels from point A to point B. The average speed of the car is 60 km/hr and it travels the first half of the trip at a speed of 45 km/hr. What is the speed of the car in the second half of the trip?