
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
There are two taps, $A$ and $B$, in a pool. If both taps $A$ and $B$ are opened simultaneously, it takes 30 minutes to fill the pool. Now, if both taps $A$ and $B$ are opened for 10 minutes, and then tap $A$ is closed with tap $B$ continuing to fill for another 40 minutes, the pool will also be filled. How many minutes does it take to fill the pool if only tap $B$ is opened?

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