
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
Someone standing on the riverbank sees a building on the opposite bank at an angle of $60^{\circ}$. If they move $30 \text{ m}$ further along the bank, they see the building at an angle of $30^{\circ}$. Calculate the width of the river and the height of the building.

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