A car travels from city A to city B. If it travels 45 kilometers per hour, it can be reached in 2.4 hours. If it is to arrive within 2 hours, how many kilometers per hour should it travel?
一辆汽车从A城到B城，如果每小时行45千米，2.4小时可以到达，如果要在2小时内到达，每小时应行多少千米？
<gadget id="calculator">2.4 / 2</gadget>
<output>1.2</output>

<gadget id="calculator">45 * 1.2</gadget>
<output>54</output>

<result>54</result>