In a water treatment plant, there are 2 pipes P and Q that can fill a reservoir in 15 hours and 10 hours respectively. There is another Pipe R that can empty the entire reservoir
hin 30 hours. All the three pipes were functioning for 2 hours, after which Pipe R was closed. After this, how long will it take to fill up the entire reservoir?
21/5 hours
22/5 hours
24/5 hours
26/5 hours
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