What is the ratio of the speed of the driving member of a gear train to that of the driven member?

The ratio of the speed of the driving member (input gear) to that of the driven member (output gear) in a gear train is inversely proportional to their gear ratiOS. This means that if the driving gear has a smaller number of teeth than the driven gear, it will rotate faster, and vice versa. The speed ratio can be calculated using the formula: Speed Ratio = Number of Teeth on Driven Gear / Number of Teeth on Driving Gear. Thus, a higher gear ratio results in a lower speed for the driven member, and a lower gear ratio results in a higher speed.