Dominik observed a chairlift. First, he found that one chair passed the lower station every 8 seconds. Then he picked one chair, pressed his stopwatch, and wanted to measure how long it would take for the chair to return to the lower station. After 3 minutes and 28 seconds, the cable car was sped up, so chairs passed the lower station every 5 seconds. When Dominik's chair passed again, the stopwatch showed 11 minutes and 13 seconds. How many chairs did the cable car have?

(Dillingerová)