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Math homework? primary school
1, the total number of teeth is equal. The revolutions are different. There are more pinions and fewer gears.

You can think of this problem as two circles with different sizes and the same distance. Because the perimeters of two circles are different, the number of turns is different when they are rotated by the same distance.

2,45: 1 = 3:1,so the front wheel1,the rear wheel 3.

Walking distance: 3 * 0.6 *π≈5.65 meters.

Climb 50 times, the distance is: 50 * 5.65 = 282.5m m.

The topic does not involve time, and it is estimated that the final question is also how many laps it takes to drive 3000m:

3000/5.65≈53 1 circle