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RRB NTPC 2026 · Question 86 of 93

An electric pump can fill a tank in 3 hours. Due to a leakage in the tank, it takes 5 1 ​hours to fill the tank. How much time will this leak take to 4 ​ empty the full tank if water does not get in or out of the tank through any other point during this period?

  1. A24 hours
  2. B7 hoursCorrect
  3. C17 hours
  4. D10 hours

Answer: B. 7 hours

Explanation

Given: ​ Time to fill tank by pump = 3hours 21 Time to fill tank with leakage = hours 4 ​ Formula Used: 1 Work rate = Time ​ Solution: 1 Pump rate = 3 ​ 1 4 1 4 Net rate = 21 = 21 ​ ​ 4 ​ 1 4 7−4 1 Leak rate = − = = 3 21 21 7 ​ ​ ​ ​ Time to empty tank = 7​

Source: RRB NTPC CBT-I Memory-Based Paper 16 March 2026 S1 (careerpower test-platform compilation) · memory-based

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