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Railways PYQCBT 1 2016

RRB NTPC · Question 66

B does 50% of a work in 20 days. C joins B and together they finish the remaining work in 4 days. C alone can do the whole work in how many days?

  1. 10
  2. 8
  3. 12
  4. 9
Show answer & explanation

Answer: (A) 10

Explanation

B does the whole work in 40 days (rate 1/40). B and C do the remaining 1/2 in 4 days, so together their rate is 1/8. C = 1/8 − 1/40 = 4/40 = 1/10, so C alone takes 10 days.