Practice Test Discussion


Two pipes A and B can fill a tank separately in 10 min and 20 min respectively. If both the pipes are used together, how much time will be taken to fill the tank?

  • Explanation

    According to the formula, if pipe A can comletely fils a tank in x hours and pipe B can comletely fill a tank in y hours, then the time taken by both pipes together to fill the tank is xyx+y hours.

    So, 10×2010+20=20030=623 minutes

    The tank will be filled by both the pipe opened simultaneously in 623 hours

    Hence option D is correct

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    Pipes and cisterns

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