If the VHS recording use NTSC you are at 60 fields per second or 50 fields per second for PAL
It is not frames per second because they are interlaced so the framer rate of NTSC is 30 frames per second where each frame is made of two interlaced fields with half the resolution at 60 fields per second.
The interlacing is there to make motions smoother and to reduce flicker.
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