Nicole walks at a speed of $2$ miles per hour and runs at a speed of …

Question

Prompt

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?

2 w + 7 r = 13

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

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

2 w + 7 r = 117