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An electric motor drives a windless which hauls up a crate A of weight W = 500 kg up an inclined plane through a height of 10 m in 2 minutes. The torque acting on the windless is 25 kgm and the drum of the windless makes 30 rpm. The efficiency of the inclined plane would be

[A].	26.50%	[B].	41%
[C].	53.05%	[D].	61%
[E].	66%

Answer: Option C

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