That's an interesting question, too.
4 seconds sound clip from the The Adventures of Superman - The Mystery of The Walking Dead classic radio series.
You can hear this line at 00:27:29 in the radio play.
Quote context
[...]
- Anything else you want to know, Lois? No. That's enough.
- Okay. Then we can go - straight to police headquarters!
- Clark? How did Superman happen to be at the temple?
- Well, now, that's an interesting question. I wish I could answer it for you.
- Well, if you do know, why can't you tell me?
- That's an interesting question, too.
- Honestly, you're impossible.
- You know, incidentally, we never did find out about that radio broadcast.
- Oh, I forgot to tell you. The Temple of Truth was on the air that night over a small local station.
[...]