A gear system has the driving wheel of radius 2 cm and driven wheel of radius 20 cm. Find the gear ratio.
20: 1
2: 1
10: 1
5: 1
Radius of driving wheel (r2) = 2 cm
Radius of driven wheel (r1) = 20 cm
Gear ratio r1: r2 = 20: 2 or 10: 1