1. A train leaves $K$ for $L$ at 09:30 while another train leaves $L$ for $K$ at 10:00. The first train arrives in $\mathrm{L} 40$ minutes after the trains pass each other. The second train arrives in K 1 hour and 40 minutes after the trains pass.
Each train travels at a constant speed.
At what time did the trains pass each other?