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Tap A was opened on an empty tank at 6 a.m., not knowing that the base had a leak. At 10 a.m. the leak was found and plugged, and the tank was filled to the level shown. If tap A keeps running, at what time will the tank be full?

Class 8Leaks and Changing PipesDirect and Inverse Proportions
  • A4:00 p.m.
  • B10:00 p.m.
  • C5:30 p.m.
  • D2:00 p.m.

Step-by-Step Solution

After plugging, of the tank is still empty and A alone fills per hour, so it needs h. 10 a.m. + 7 h 30 min = 5:30 p.m. (4 p.m. forgets the leak's lost water.)
Answer: C) 5:30 p.m.

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