Mathematics
Medium
Question
A water tank is two-fifth full. Pipe A can fill a tank in 10 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely?
A
6 min. to empty
✓ Official correct answer
B
6 min. to full
C
9 min. to empty
D
9 min. to full
Community credibility
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A
6 min. to empty
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B
6 min. to full
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C
9 min. to empty
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D
9 min. to full
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