Task: Question Answering
Input (English): Question: A chemical lab is scheduled to go through two air ventilation systems, a basic system and a more advanced system that takes forty minutes and 1.5 hours respectively to fully ventilate the room. If both ventilation systems were to operate at the same time with their respective constant rates, how many hours would it take to fully ventilate the chemical lab?

 Option A: 2/7

 Option B: 3/10

 Option C: 5/11

 Option D: 6/13

 Option E: 7/15
Output (English): Option D