1. How far can a bicycle go by pedaling?

2. What is the relationship between the number of teeth and revolutions of the front gear and the number of teeth and revolutions of the rear gear?

3. How many gears can I change for a variable-speed bicycle with two front gears and six rear gears?

4. A variable-speed bicycle, with two front gears and six rear gears, has the same number of pedals. Which combination makes the bicycle go farthest?

Second, the formula used:

1, the number of teeth in the front gear multiplied by the number of teeth in the front gear is equal to the number of teeth in the rear gear multiplied by the number of teeth in the rear gear.

2. The distance of pedaling once is equal to the circumference of the riding wheel after dividing the number of teeth in the previous gear.