The efficiency of the first faucet is $\frac1{18}$ and that of the other two is $\frac29$.  Thus it takes $1\div (\frac1{18}+\frac29\times2)=2$ hours to fill the pool. 
Water from the first faucet fills the swimming pool in $18$ hours. Water from each of the two other faucets fills the same swimming pool $4$ times faster. In how many hours will the swimming pool be filled if all three faucets are opened? 
Options:
A. $$1$$ 
B. $$2$$ 
C. $$3$$ 
D. $$4$$ 
E. $$5$$ 