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1. A car travles 180 km from A to B at 60 kilometers/hour and returns from B to A along the same route at 90 kilometers/hour. The average speed in kilometers per hour for the round trip is:
- A. 72
- B. 72
- C. 72
- D. 72
Answer: Option A
Explanation:
Total distance covered = 180 + 180 = 360 km
Time taken in route AB = 180 / 60 = 3 hr
Time taken in route BA = 180 / 90 = 2 hr
Total time taken = 3 + 2 = 5 hr
Average speed = 360 / 5 = 72 km/hr
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