9. Teacher Wang and Teacher Li are walking around a circular path by the lake. They start from the same point at the same time, walking in opposite directions. After meeting, Teacher Wang continues walking in the original direction for 40 minutes to return to the starting point. It is known that Teacher Li takes 30 minutes less than Teacher Wang to walk around the path once. Therefore, Teacher Wang takes $\qquad$ minutes to walk around the path once.
$60$