Exact 60fps Frame Rate of iPhone SE

This question may be applicable to any of the newer iPhones that can shoot 1080p video at 60fps.

There is always audio/video drift when I edit video shot on an iPhone SE at 60fps. I suspect this is because the metadata in the video files has the wrong frame rate. My editing software reports that the video frame rate is 59.9401.

Does anyone know the actual exact frame rate? I can change how my editing software interprets the fps so I can fix the drift issue with that.