A pipe can fill a tank in 20 minutes and another pipe can fill the tank in 40 minutes There is a was...........

Quantitative Aptitude ( CCS) Pipes&cistern

A pipe can fill a tank in 20 minutes and another pipe can fill the tank in 40 minutes. There is a waste pipe which can empty the tank in 15 minutes. First two pipes are opened for 5 minutes and then the third pipe is also opened. In what time the cistern is emptied after the third pipe also opened ?

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