
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
A swimming pool contains 300 m<sup>3</sup> of water. Now, the drain is opened to drain water at a rate of 25 m<sup>3</sup> per hour.  
(1) Write the function relationship between the remaining water volume $Q$ (in m<sup>3</sup>) and the drainage time $t$ (in hours), and the range of values for the independent variable;  
(2) How many hours does it take to drain until there is only 150 m<sup>3</sup> of water left in the pool?

Present the answer in LaTex format: \boxed{Your answer}
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