calculate Time Between Two Frames using FrameRate

calculate Time Between Two Frames using FrameRate :
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1.fDistanceBetweenTwoFrames = 1000 / FrameRate;
2.fDistanceBetweenTwoFrames = 33.33 for 30 FPS
3.fDistanceBetweenTwoFrames = 40 for 25 FPS