A car travels a distance of 100 km. For the first 30 minutes it is driven at a constant speed of 80 km/hr. The motor begins to vibrate and the driver reduces the speed to 40 km/hr for the rest of the trip. The average speed for the entire trip is
A. 50.0 km/hr.
B. 60.0 km/hr.
C. 53.3 km/hr.
D. 47.5 km/hr.
E. 40.0 km/hr.
Answer: A
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Fill in the blank(s) with correct word
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