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

A man of mass 60 kg lifts a 15 kg mass to the top of a building of hei

1.	A man of mass 60 kg lifts a 15 kg mass to the top of a building of height 10m in 5 minutes. H is efficiency is
Answer» `10%` `20%` `30%` `40%` ANSWER :B