This riddle has been around for some time on internet platforms such as Instagram, Facebook, and WhatsApp, and many people still argue over what the answer might be, as there are many possibilities. The correct answer is The patient will take 1 hour to consume all five tablets. Suppose he takes the first tablet at 8:00 PM. He will take the subsequent tablets at 8:15 PM, 8:30 PM, 8:45 PM and 9:00 PM.