Two pulleys are connected by a belt. The sum of the diameters of two pulleys is 90 cm and while the one makes 50 rpm, the other makes 20 rpm. Find the diameter of other pulley.

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Two pulleys are connected by a belt. The sum of the diameter of two pulleys is 90 cm and while one makes 50 rpm, the other makes 20 rpm. What will be the diameters of the other pulley?

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