2023 Gauss 8 Problem 22

It took Nasrin two hours and thirty minutes to canoe the 4.5 km into her camp. Paddling much faster, the return trip took her \frac{1}{3} of the time. What was Nasrin's mean (average) speed as she paddled to camp and back?

\textbf{(A)}\ 1.25 \text{ km/h}\quad \textbf{(B)}\ 3.96 \text{ km/h}\quad \textbf{(C)}\ 1.8 \text{ km/h}\quad \textbf{(D)}\ 1.95 \text{ km/h}\quad \textbf{(E)}\ 2.7 \text{ km/h}

If there are no answer choices shown, enter a numerical answer.

Full credit to this problem is given to the CEMC, you may view all Gauss contests here.