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Railways PYQCBT 2 2017

RRB NTPC · Question 42

D can do a work in 18 days and E can do the same work in half that time. How many days will they take to finish the work, doing it together?

  1. 5

  2. 4

  3. 7

  4. 6

Show answer & explanation

Answer: (D) 6

Explanation

E takes 9 days. Together they do 1/18 + 1/9 = 3/18 = 1/6 of the work per day, so they finish in 6 days.