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Q:

A pipe can empty a tank in 40 minutes. A second pipe with diameter twice as much as that of the first is also attached with the tank to empty it . The two pipe together can empty the tank in: 

  • 1
    8 minutes
  • 2
    13 minutes
  • 3
    30 minutes
  • 4
    38 minutes
  • Show Answer
  • Workspace

Answer : 1. "8 minutes"

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