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Let the efficiency of 'B' be 'x' units/day So, efficiency of 'A' = x × 1.3 = '1.3x' units/day So, total work = (1.3x + x) × 15 = '34.5x' units Work done in 10 days = 10 × (1.3x + x) = '23x' units So, work remaining = 34.5x - 23x = '11.5x' units So, time taken by 'B' to finish the remaining work = 11.5x ÷ x = 11.5 days
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