It can take \( 12 \mathrm{~h} \) to fill a swimming pool using two (W) pipes. If the pipe of lar...

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It can take \( 12 \mathrm{~h} \) to fill a swimming pool using two
(W) pipes. If the pipe of larger diameter is used for \( 4 \mathrm{~h} \) and the pipe of smaller diameter for \( 9 \mathrm{~h} \), only half the pool can be filled. How long would it take for each pipe to fill the pool separately?
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