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Railways PYQCBT 1 2016

RRB NTPC · Question 42

If one pipe P can fill a tank in 10 minutes, then 5 pipes, each of 20% efficiency of P, can fill the tank in A. 10 minutes B. 50 minutes C. 130 minutes D. 175 minutes

  1. A

  2. D

  3. C

  4. B

Show answer & explanation

Answer: (A) A

Explanation

Five pipes at 20% efficiency together equal 5 × 0.2 = 1 pipe P, so they fill the tank in the same 10 minutes.