Question

Carrie ran some of the miles and walked some of the miles in a 10-mile race. Each mile she ran took 9 minutes, and each mile she walked took

16 minutes. She finished the race in 120 minutes.
Which system of equations can be used to determine the number of miles Carrie ran, r, and walked, W?
r+9 = 10
ОА.
W + 16 = 120
B.
r = 10w
9r + 16w = 120
OC.
r+w = 10
9r + 16w = 120
D.
r+w = 10
16r + 9w = 120

Answer 1

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Answer:

C. r+w = 10; 9r + 16w = 120

Explanation:

The problem statement describes two relationships. Each of these gives rise to an equation.

total miles: r + w = 10

total time: 9r +16w = 120