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Railways PYQCBT 1 2016

RRB NTPC · Question 32

P can do a work in X days. He finished 1/6 of the entire work and then Q alone finished the rest in 15 days. If together they can finish half of the work in 45/8 days, then find the value of X? A. 90/11 B. 30 C. 42 D. 32/8

  1. B

  2. D

  3. C

  4. A

Show answer & explanation

Answer: (A) B

Explanation

Q does 5/6 of the work in 15 days, so Q alone takes 18 days. Together they do half the work in 45/8 days, i.e. the whole in 45/4 days: 1/X + 1/18 = 4/45, so 1/X = 3/90 and X = 30.