The team members of "Re-walking the Long March" traveled from Yeping to Yunshi Mountain, the first mountain in the Long March, and planned to travel 4.5 kilometers per hour and arrive in 5 hours. The actual extra 0.5 kilometers per hour, how many hours did it actually arrive? (Solution with proportional knowledge)
"重走长征路"的队员从叶坪到长征第一山--云石山，计划每小时行4.5千米，5小时到达．实际每小时多行了0.5千米，实际几小时到达？(用比例知识解)
<gadget id="calculator">4.5 * 5</gadget>
<output>22.5</output>

<gadget id="calculator">4.5 + 0.5</gadget>
<output>5</output>

<gadget id="calculator">22.5 / 5</gadget>
<output>4.5</output>

<result>4.5</result>