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

a) 19.7cm, 70.3 cm
b) 23.4 cm, 68.7 cm
c) 25.7 cm, 64.3 cm
d) 21.1 cm,63.2 cm

Answer: c
Explanation: D1 + D2 = 90cm
Or, 50 * D1 = 20 * D2
Or, D2 = 2.5 D1
Now, D1 + 2.5 D1 = 90
D1 = 25.7 cm
D2 = 64.3 cm

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