Answer
24 frames
Explanation
First lets us ask ourselves how many seconds there are in 1 hour.
1 hour = 60 × 60
= 3600 seconds.
86,400 frames ⇒ 1 hour
86,400 frames ⇒ 3,600 seconds
? frames ⇒ 1 second
We cross multiply.
In 1 second = (86,400 × 1)/3,600
= 86,400/3,600
= 24 frames
