Aman of mass 60kg lifts a 15 kg mass to the top of a building of height 10 m in 5 minutes. H is efficiency is

Aman of mass 60kg lifts a 15 kg mass to the top of a building of heigh

1.	Aman of mass 60kg lifts a 15 kg mass to the top of a building of height 10 m in 5 minutes. H is efficiency is
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