# Washer

Washing machine drum wash at 58 RPM. Washing machine motor pulley has diameter 9 cm. What must be the diameter of the drum machine pulley when the motor is at 438 RPM?

Result

D =  68 cm

#### Solution:

$D = \dfrac{ 438}{ 58} \cdot 9 = 68 \ \text{ cm }$

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