Mathematics
Medium
Question
A cistern has two taps which fill it in 12 min. and 15 min.respectively There is one outlet pipe in the cistern. When all the taps & pipe are opened, the empty cistern is full in 20 min. How long will the waste pipe (outlet) take to empty the full cistern ?
A
10 min
✓ Official correct answer
B
20 min
C
30 min
D
40 min
Community credibility
Registered members can vote for the answer they believe is correct today and explain why. If the facts change after an election or news event, suggest a new option so others can vote it up.
A
10 min
No member explanations yet for this option.
B
20 min
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C
30 min
No member explanations yet for this option.
D
40 min
No member explanations yet for this option.