ANSWERS: 1
  • speeds have to be averaged over equal times, not equal distances. If you did it over distances you'd get 25mph. The car was faster on the way back, so took less time getting back, so if you average over an equal times, the faster speed will have less time to "influence" the average than the slower one. So the result will be slower than 25mph. If you want to work it out, just pick a convenient distance for A to B: 60 miles say. So 3 hours there, 2 hours back. Total distance = 120 miles Total time = 5 miles. Divide.

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