prakash takes an hour to distribute news paper in a block of apartment while his two friends take 80 minutes to do same work individually. if all the three distributive news papers in 2 such blocks of apartment. howll long would they take?
prakash takes an hour to distribute news paper in a block of apartment while his two friends take 80 minutes to do same work individually. if all the three distributive news papers in 2 such blocks of apartment. howll long would they take?
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let distributing newspaper in one apartment be one unit of work . so efficiency of prakash =1/60 , friend 1 =1/80 , friend 2 =1/80 for 1 apartment , if all three distributes simultaneously, E = 1/60+1/80+1/80 = 1/24 so all three will take 24 minutes to distribute newspapers in one apartment. twice of this time will be required to distribute newpaper in 2 apartments =24*2 = 48minutes.