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Railways PYQCBT 2 2017

RRB NTPC · Question 8

K and L can do a work in 15 and 20 days respectively. They work together for 5 days and leave. Calculate the unfinished portion of the work.

  1. 7/12

  2. 5/12

  3. 1/13

  4. 1/4

Show answer & explanation

Answer: (B) 5/12

Explanation

Together they do 1/15 + 1/20 = 4/60 + 3/60 = 7/60 of the work per day. In 5 days they finish 35/60 = 7/12, leaving 5/12 unfinished.