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A delivery cart went from Candle ford to Lark Rise and back at an average speed of $\tfrac{2}{3}$ miles per hour. If the distance from Candle ford to Lark Rise is 1 mile, and the trip back took half as much time as the trip there, what was the average speed of the delivery cart of the way to Lark Rise?

1. A $\tfrac{1}{2}$
2. B $\tfrac{1}{3}$
3. C $\tfrac{2}{3}$
4. D $\tfrac{3}{4}$