78 miles an hour.
4 seconds sound clip from the Planes, Trains & Automobiles (1987) movie soundboard.
You can hear this line at 01:17:35 in the Blu-ray version of the movie.
Quote context
[...]
- What the hell are you driving?
- We had a small fire last night, but we caught in the nick of time.
- You have any idea how fast you were going?
- Funnily enough, I was just talking to my friend about that.
- 78, huh?
- Well, yeah. I can buy that. Sure. I guess.
- You know, you'd know better than us.
- Especially since we've got a melted speedometer.
- Do you feel this vehicle is safe for highway travel?
[...]