Mathematics · Time and Work
Suppose A, B, and C are three taps fixed to the bottom of a tank with draining capacities in the ratio 1 : 2 : 3. When all three are open, it takes 1 hour to drain the full tank. If taps A and C are open but B is closed, how much time, in minutes, will it take to empty the full tank?
- 1120
- 2105
- 390✓
- 475
Correct answer
90
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