"Two trains on different and separate tracks, 30 miles from each other are approaching each other, each at a speed of 10 mph. How long before they crash into each other?"
"Two trains on separate tracks, 30 miles from each other are approaching each other, each at a speed of 10 mph. How long before they crash into each other?"
"Two trains on different and separate tracks, 30 miles from each other are approaching each other, each at a speed of 10 mph. How long before they crash into each other?"
...it spots the trick: https://chat.openai.com/share/ee68f810-0c12-4904-8276-a4541d...
Likewise, if you add emphasis it understands too:
"Two trains on separate tracks, 30 miles from each other are approaching each other, each at a speed of 10 mph. How long before they crash into each other?"
https://chat.openai.com/share/acafbe34-8278-4cf7-80bb-76858c...
Not to anthropomorphize, but perhaps it's not necessarily missing the trick, it just assumes that you're making a mistake.