Gear A has 30 teeth & Gear B has 20 teeth. If Gear A rotates at 1000rpm, what speed does Gear B rotate at?

The speed that gear B rotates at is 1500 rpm

Explanation:

Number of teeth on gear A = 30

Number of teeth on gear B = 20

Therefore, one complete revolution of gear A will go round 30 teeth while one revolution of gear B is equivalent to 20 teeth

Hence, we have 1000 revolution will go round = 30 * 1000 = 30000 teeth

For gear B, therefore, we have 30000 teeth will give; 30000/20 = 1500 revolutions

Hence the speed that gear B rotates at = 1500 revolutions per minute.