car travels from A to B. Travel 45 kilometers per hour and arrive in 2.4 hours. It took 2.5 hours to return, how many kilometers per hour on average?
一辆汽车从甲地开往乙地．每小时行45千米，2.4小时到达．返回时行了2.5小时，平均每小时行多少千米？
<gadget id="calculator">2.4 / 2.5</gadget>
<output>0.96</output>

<gadget id="calculator">45 * 0.96</gadget>
<output>43.2</output>

<result>43.2</result>