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2 years ago

10

Theodora drove on the blue ridge parkway at 40 mph and then on the interstate highway at 70 mph. She drove three times as long o

n the blue ridge parkway as she did on the interstate. If she drove a total of 285 mi, for how long did she drive on the interstate?

1 answer:

klasskru [66]2 years ago

6 0

3x × 40+ x × 70 = 285
120x + 70x = 285
190x = 285
x = 285/190
x = 1.5
Theodory traveled at the interstate for 1.5 hours

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