Respuesta :
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Answer: 7 km
Explanation:
3.5 x 2 = 7
I hope this helped!
<!> Brainliest is appreciated! <!>
- Zack Slocum
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Step-by-step explanation:
Lets x be the distance for the marathon.
Given,
[tex] \frac{1}{2} x = 3.5km[/tex]
[tex]x = 3.5 \div \frac{1}{2} \\ = 3.5 \times 2 \\ = 7km[/tex]