ATQ,
Let total work = 160 units {LCM of 32 and 40} Efficiency of 'Aman' = (160/32) = 5 units/day Efficiency of 'Bhanu' = (160/40) = 4 units/day New efficiency of 'Aman' = 0.6 X 5 = 3 units/day New efficiency of 'Bhanu' = 1.25 X 4 = 5 units/day Therefore, combined efficiency of 'Aman' and 'Bhanu' = 3 + 5 = 8 units/day Required time taken = (160/8) = 20 days
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