Mom took Xiaole to the park to play, and paid the parking fee of 18 yuan according to the parking fee standard after coming out. The charging standard is: 5 yuan within 1 hour (including 1 hour), and 1.3 yuan per 0.5 hours for more than 1 hour. How long did they play in the park?
妈妈带小乐到公园游玩，出来后按停车收费标准交停车费18元．收费标准是：1小时以内(含1小时)收费5元，超过1小时，每0.5小时收费1.3元．她们在公园游玩了多长时间？
<gadget id="calculator">18 - 5</gadget>
<output>13</output>

<gadget id="calculator">13 / 1.3</gadget>
<output>10</output>

<gadget id="calculator">10 * 0.5</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>