A tap P can fill a tank in 20 hours and another tap Q can fill the tank in 30 hours. Both pipe are opened at 6 AM and after some time Q is closed. If the tank is filled by 9 PM on the same day, Then at what time was tap Q is closed.
(a) 12:30PM
(b) 1:30 PM
(c) 1 PM
(d) 2:30 PM
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