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It takes 24 hours to fill a swimming poo...

It takes 24 hours to fill a swimming pool using two pipes. If the pipe of larger diameter is used for 8 hours and the pipe of the smaller diameter is used for 18 hours. Only half of the pool is filled. How long would each pipe take to fill the swimming pool.

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The correct Answer is:
`:.` To fill the full tank the larger pipe takes 40hrs
To fill the tank the smaller pipe takes 60 hrs.
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