$188$
11. Fei Ge drove from location $\mathrm{A}$ to location $\mathrm{B}$. If for the first half of the planned time he drove at $35 \mathrm{~km}$ per hour and for the second half of the time at $45 \mathrm{~km}$ per hour, he would arrive on time. In reality, the car traveled at a speed of $40 \mathrm{~km}$ per hour until it was $50 \mathrm{~km}$ short of the midpoint of $\mathrm{AB}$, when it broke down. After a 72-minute repair, it continued at a speed of $60 \mathrm{~km}$ per hour and still arrived at $\mathrm{B}$ on time. The distance between $\mathrm{A}$ and $\mathrm{B}$ is $\qquad$ $\mathrm{km}$.