Question
Mathematics Question on Pipe and Cistern
Two pipes A and B can fill a cistern in 15 minutes and 30 minutes respectively. Both pipes are opened together, but after 5 minute pipe B is turned off. The cistern will be full in total:
A
10 minutes
B
7.5 minutes
C
15 minutes
D
12.5 minutes
Answer
12.5 minutes
Explanation
Solution
The correct option is (D):12.5 minutes