Mathematics
Medium
Question
A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the taps are opened simultaneously, then after how much time will the cistern get filled?
A
4.5 hrs
B
5 hrs
C
6.5 hrs
D
7.2 hrs
✓ Official correct answer
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
4.5 hrs
No member explanations yet for this option.
B
5 hrs
No member explanations yet for this option.
C
6.5 hrs
No member explanations yet for this option.
D
7.2 hrs
No member explanations yet for this option.