Mathematics
Medium
Question
Two pipes A and B can fill a cistern in 37 1/2 minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if the pipe B is turned off after?
A
5 min
B
9 min
✓ Official correct answer
C
10 min
D
15 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
5 min
No member explanations yet for this option.
B
9 min
No member explanations yet for this option.
C
10 min
No member explanations yet for this option.
D
15 min
No member explanations yet for this option.