There's a lot of misunderstanding in this thread about how captchas work.

What modern captchas examine isn't actually your ability to solve the puzzle... It's how you solve it. Things like mouse movements and how you type are big factors. So a bot would process for a moment, and then basically copy and paste in the answer, whereas as a human is going to type at a normal pace, often with pauses as they double check the details. Same goes for the click the tiles challenges. A bot will work through systematically, a human will bounce around, and their timings will be very different.