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WBCS Main Examination 2023 — Paper VI: Arithmetic and Test of Reasoning · Question 125 of 200

Q125
ArithmeticTime & Work, Pipes & Cisterns
A alone can do a piece of work in 21 days. B who is 40% more efficient than A, will finish the work in:
  1. a.10 days
  2. b.12 days
  3. c.15 days
  4. d.18 days

Answer: (C) 15 days

B does 1·4 times A's daily work, so B needs 21 ÷ 1·4 = 15 days. Cutting 40% off A's time gives about 12·6 days, which is the usual trap.

Q124 Whole paperQ126