Problem
2016 Fermat Problem 15
Hicham runs 16 km in 1.5 hours. He runs the first 10 km at an average speed of 12 km/h. What is his average speed for the last 6 km?
\textbf{(A)}\ 8 \text{ km/h}\quad \textbf{(B)}\ 9 \text{ km/h}\quad \textbf{(C)}\ 10 \text{ km/h}\quad \textbf{(D)}\ 6 \text{ km/h}\quad \textbf{(E)}\ 12 \text{ km/h}
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