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Let efficiency of ‘B’ ‘5x’ units per day
Efficiency of ‘A’ = 1.60 × 5x = 8x units per day
Efficiency of ‘C’ = 1.375 × 8x = 11x units per day
Total work = (3x + 8x + 11x) × 40 = 960x units
Desired time = (0.75 × 960x)/8x = 90 days
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