Allied & ICAR Exam Bank • ALLIED_1990 MCQ • 1 Mark

Section 8: General Aptitude

Quantitative Aptitude

Subtopic: Numerical Computation

Question Statement:

An inlet pipe fills a tank in 10 hours and a drain pipe empties it in 15 hours. Both are opened when the tank is empty. After 12 hours, the drain pipe is closed. How much more time is needed to completely fill the tank?

Options:

  • (A) 6 hours
  • (B) 5 hours
  • (C) 4 hours
  • (D) 8 hours

Answer Key:

A

Step-by-Step Solution & Explanation

Net rate = $1/10 - 1/15 = 1/30$. In 12 hrs, filled = $12/30 = 2/5$. Remaining = $3/5$. Time = $(3/5) / (1/10) = 6$ hours.
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