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ATQ,
Let the efficiencies of Neha, Karan, and Ishaan be 16x, 11x, and 14x units/day, respectively.
Total work = (16x + 11x + 14x) × 30 = 1230x units
Work done by Neha and Karan in 20 days = 20 × (16x + 11x) = 540x units
Remaining work = 1230x – 540x = 690x units
Time taken by Neha and Ishaan together = 690x / (16x + 14x) = 690x / 30x = 23 days
Total time to finish the work = 20 + 23 = 43 days
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