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A speed multiplier is a device used to increase the speed of a machine or system. An example of a speed multiplier is a gearbox, which is commonly used in automobiles to increase the speed of the wheels relative to the engine. For example, if an automobile has an engine that rotates at 3000 revolutions per minute (RPM) and the wheels have a diameter of 24 inches, the car would have a maximum speed of around 45 miles per hour. However, by using a gearbox with a speed multiplier of 3, the wheels can rotate at 9000 RPM, which would increase the car's maximum speed to around 135 miles per hour. Another example of a speed multiplier is a turbocharger, which is commonly used in high-performance engines to increase the amount of air that can be delivered to the engine, allowing it to produce more power. The turbocharger uses exhaust gas to drive a turbine, which in turn drives a compressor that compresses the air going into the engine. This increases the air density and allows more fuel to be burned, resulting in a higher output power. The speed of the turbine can be many times higher than the engine speed, which effectively acts as a speed multiplier for the compressor.
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wheels, axles, inclined plane are the examples of speed multipliers
Answer

Wheels and axles and third class levers.

Answer
speed multipliers are useful when an object need to move up further distance or at a higher speed let's example wheels and excels and third class levers machine can be either simple or complex simple

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