Task: Question Answering
Input (English): Passage: As an avid mountain biker , I have found myself in many precarious situations . From run ins with bears , to falling into prickly bushes . It is always an adventure when you are riding your mountain bike through the great outdoors . I have had numerous flat tires during my years riding . The first flat tire I ever had left me stranded miles away form civilization . I had to hoof it out on foot , carrying a broken bike . From then on I purchased and kept many bicycle tire tubes in my riding gear . To replace a bicycle tire is now a simple process for me . You break the bead on the old tire shell and pull it slightly to the side . You then stuff the new rubber tube where the old one was , making sure the nipple matches with the nipple hole . You then move the outer tire back into position and pump up the tire . Question: When did they get flat tires? Option1: when riding bike Option2: During the car ride.
Output (English): when riding bike