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Here we can apply work-energy THEOREM. There are 30 steps .Each STEP has 20cm height. So total height is 6m.So work by boy =mgh=40*6*10=2400J. Similarly work by girl =1800J. Power of boy=2400/4=600J/min. Similarly work by boy=1800/3=600J/min .So both have same power .If I am WRONG ,I am sorry. (Here I used g=10m/s)



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