Question
A pipe can fill a cistern in 12 minutes and another pipe can till it in 15 minutes. But a third pipe can empty it in 6 minutes. The first two pipes are kept open for 5 minutes in the beginning and then the third pipe is also opened. In what time is the cistern emptied?
Answer: Option C
Submit Your Solution Below and Earn Points !
Submit Your Solution Below and Earn Points !
Submit Solution