Railways
Quantitative Aptitude
Pipes & Cisterns
Sample Paper
Pipes and Cisterns Sample Test Paper-11
question_answer
Two pipes A and B can fill a cistern in 10 and 15 minutes respectively, but an empty pipe C can empty it in 5 minutes. The pipes A and B are kept open for 4 minutes and the emptying pipe C also opened, hi what time is the cistern emptied?