A car travels 52.4 kilometers per hour and arrives at the destination in 2.5 hours. If you want to arrive within 2 hours, how many kilometers per hour should you travel on average?
一辆汽车每小时行52.4千米，2.5小时到达目的地，如果要赶在2小时内到达，平均每小时至少行多少千米？
<gadget id="calculator">2.5 / 2</gadget>
<output>1.25</output>

<gadget id="calculator">52.4 * 1.25</gadget>
<output>65.5</output>

<result>65.5</result>