One day, Xuexue and Sisi made an appointment to meet at Tiananmen Square. Xuexue walked 2 kilometers per hour, and Sisi walked 3 kilometers per hour. They set off at the same time and walked toward each other. After 2 hours, they were still 10 kilometers apart, so Xuexue How many kilometers is the distance between Sisi and Sisi.
一天，学学和思思约好在天安门见面，学学每小时走2千米，思思每小时走3千米，他们同时出发相向而行，2小时后还相距10千米，则学学和思思之间的距离是多少千米．
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">10 + 10</gadget>
<output>20</output>

<result>20</result>