Pipe Q can fill the tank in 60 hours while pipe R can fill it in 45 hours. Q and R pipes are opened together for 6 hours after which pipe W is also op...
Question
Pipe Q can fill the tank in 60 hours while pipe R can fill it in 45 hours. Q and R pipes are opened together for 6 hours after which pipe W is also opened to empty the tank. All three pipes are opened simultaneously for 24 hours to reach the half level mark. How much time (in hours) will pipe W alone take to empty the entire tank?