A train travels from A to B at 60 km/h and returns along the same road at 30 km/h. What is the average speed for the whole trip, in km/h?
Answer and explanation
Correct answer: A.
- Step 1: For a distance each way, total time is . Step 2. Average speed . **Answer: . Why not the others:** takes the simple average of the two speeds; adds 5 to the simple average; uses the difference of the speeds.
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