\text{Average} = \frac{12.5 + 8}{2} = \frac{20.5}{2} = 10.25
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- 5Question: An elementary school student learns that the average time it takes for sunlight to reach Mars is about 12.5 minutes, while it takes 8 minutes to reach Earth. If a beam of light is sent simultaneously from the Sun to both Mars and Earth, what is the average travel time, in minutes, for the light to reach the two planets?
- Solution: To find the average travel time, we compute the arithmetic mean of the two times: 12.5 minutes and 8 minutes. The formula for the average is:
- Thus, the average time is 10.25 minutes.
- \boxed{10.25}
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