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Railways PYQCBT 1 2016

RRB NTPC · Question 13

G is twice as fast as S in doing work. If G can do a work in 30 days, in how many days will they take to complete the work together? A. 25 B. 20 C. 22 D. 15

  1. D

  2. B

  3. A

  4. C

Show answer & explanation

Answer: (B) B

Explanation

G finishes the work in 30 days and is twice as fast as S, so S takes 60 days. Together they do 1/30 + 1/60 = 3/60 = 1/20 of the work per day, so they finish in 20 days.