Junjun and his younger brother went to the playground, and each paid 16 yuan for the first hour, and 8 yuan per hour thereafter. After the game, the two paid a total of 64 yuan. How many hours did they play in the playground?
军军和弟弟到游乐场游玩，每人第一个小时付款16元，以后每小时付款8元，游玩后两人共付了64元，他们在游乐场玩了几小时？
<gadget id="calculator">16 * 2</gadget>
<output>32</output>

<gadget id="calculator">64 - 32</gadget>
<output>32</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<gadget id="calculator">32 / 16</gadget>
<output>2</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<result>3</result>