Mathematics
NULL
Medium
Question
A and B fill a cistern in 12 and 15 minutes. Both open for 3 minutes then A is turned off. How much more time to fill?
A
3 1/4 min
B
5 1/4 min
C
8 1/4 min
✓ Official correct answer
D
9 1/4 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
3 1/4 min
No member explanations yet for this option.
B
5 1/4 min
No member explanations yet for this option.
C
8 1/4 min
No member explanations yet for this option.
D
9 1/4 min
No member explanations yet for this option.
Explanation
In 3 min they fill 9/20. Remaining 11/20 by B takes 8 1/4 min.