
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 pool has two drain taps, A and B. If both taps are opened simultaneously, it takes 30 minutes to drain the full pool. If both taps are opened for 10 minutes and then tap A is closed while tap B continues, it also takes 30 more minutes to drain the full pool. How many minutes will it take to completely drain the full pool with only tap B open?

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