Mathematics · Time and Work
Pipes A and B can fill an empty tank in 30 hours and 40 hours, respectively. Pipe C is an emptying pipe. When the tank is empty and all three pipes are opened together for 20 hours, 1930 of the tank remains unfilled. In how many hours can pipes B and C together empty 30% of the filled tank?
- 115
- 218
- 320✓
- 424
Correct answer
20
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