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RRB NTPC 2017 · Question 263 of 1076

A water tank has two holes. The $$1^{st}$$ hole alone empti es the tank in 9 minutes and $$2^{nd}$$ hole alone empties the tank in 6 minutes. If water leaks out at a constant rate, how many minutes does it take if both the holes together empty the tank?

  1. A$$3\frac{3}{5}$$Correct
  2. B$$\frac{3}{5}$$
  3. C$$3\frac{1}{5}$$
  4. D$$3\frac{2}{5}$$

Answer: A. $$3\frac{3}{5}$$

Official answer key verified. Detailed explanation coming soon.

Source: RRB NTPC Tier-2 (CEN 03/2015) 17-Jan-2017 Shift-1 — solved paper with answer key · reliable-secondary

← Q262View full paper (1076 questions)Q264 →

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