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 80 km/hr. What is the speed of the car in the second half of the trip? Choose the correct choice from the following choices:  A) 40  B) 42  C) 45  D) 48  E) 50
Let D be the distance and let V be the speed in the second half.   The total time = T1 + T2   48/60 = 48/160 + (48/2) / V   848/480 - 348/480 = (48/2) / V   48/96 = 48/2V and so V = 48 km/hr   The answer is 48.
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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 80 km/hr. What is the speed of the car in the second half of the trip?