A car travels at and then returns the same at . Find the average speed for the whole journey.
Answer and explanation
Correct answer: A.
- Step 1: Times: and hours, total hours. Step 2. Average speed . **Answer: . Why not the others:** is what you get if you take the mean of the two speeds. is what you get if you ignore the speeds. is what you get if you forget to double the distance.
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