A
cistern can be filled separately by two pipes P and Q in 36 minutes and 45 minutes
respectively. A tap R at the bottom can empty the full cistern in 30 minutes.
If the tap R is opened 7 minutes after the pipes P and Q are opened. Find when
the cistern becomes full?
a)
39 minutes
b) 46
minutes
c)
32 minutes
d) None.
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