Step-by-step explanation:
Notice it is not asking for an average rate, just her current rate. Approach this like this: say she is at the 29 mile "marker." In 3 hours, she gets to the 38th mile "marker." Therefore:
38-29 = 9, so in 3 hours, she went 9 miles.
9 miles/3 hours = 3 miles per hour, which would be equal to her current rate.
