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Math·Algebra·Linear equations in two variables

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Nicole walks at a speed of $2$ miles per hour and runs at a speed of $7$ miles per hour. She walks for $w$ hours and runs for $r$ hours for a combined total of $13$ miles. Which equation represents this situation?

A

$2w+7r=13$

B

$\frac{1}{2}w+\frac{1}{7}r=13$

C

$\frac{1}{2}w+\frac{1}{7}r=117$

D

$2w+7r=117$