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Q: Pipes A, B and C can fill a tank in 30h, 40h and 60h respectively. Pipes A, B and C are opened at 7 a.m., 8 a.m. and 10 a.m., respectively on the same day. When will the tank be full ?
  • A. 10:00 PM
  • B. 9:20 PM
  • C. 10: 20 PM
  • D. 9:40 PM
Correct Answer: Option B -
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Explanations:

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