posted by scooby doo .
Marla begins walking at 3 mi/h toward the library. Her friend meets her at the halfway point and drives her the rest of the way to the library. the distance tho the library is 4 miles. how many hours did marla walk?
She walked half the distance, or 2 miles.
2 miles * 1h/3mi = 2/3 hours
2/3 hours or 40 minutes