Question:medium

A pipe 'P' can fill a tank in 20 hours and another pipe 'Q' in 30 hours. If both pipes are opened in an empty tank, how much time will they take to fill it?

Show Hint

Total time = $\frac{xy}{x+y} = \frac{20 \times 30}{20 + 30}$.
Updated On: Jun 26, 2026
  • 12 hours
  • 15 hours
  • 20 hours
  • 50 hours
Show Solution

The Correct Option is A

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