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Railways PYQCBT 1 2016

RRB NTPC · Question 79

M can do a work in 5 days. R can do the same work in 20 days. In how many days will they finish the same work together? A. 4 days B. 3 days C. 2 days D. 1 days

  1. D

  2. C

  3. A

  4. B

Show answer & explanation

Answer: (C) A

Explanation

M does 1/5 and R 1/20 of the work per day; together 1/5 + 1/20 = 5/20 = 1/4. They finish in 4 days.