After running for 3 1/2 km, Sacha only completed half the total distance of a marathon . What is the complete distance of that marathon? And please don't send in file you can comment and tell me what to do okay​

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Answer: 7 km

Explanation:

3.5 x 2 = 7

I hope this helped!

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- 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]