Question
'A' and 'B' together build a wall in 48 days. If 'A'
builds the wall in 120 days, then find the time taken by 'B' to build the wall.Solution
Let the total work be 240 units (LCM of 48 and 120)Combined efficiency of 'A' and 'B' = (240/48) = 5 units/dayEfficiency of 'A' = (240/120) = 2 units/daySo, efficiency of 'B' = 5 - 2 = 3 units/dayTherefore, required time = (240/3) = 80 days
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