A car transports goods from City A to City B, traveling an average of 45.6 kilometers per hour and arriving in 4.2 hours. It took 3 hours to return, how many kilometers per hour on average?
一辆汽车从甲城运货到乙城平均每小时行45.6千米，4.2小时到达．返回时用了3小时，平均每小时行多少千米？
<gadget id="calculator">191.52 / 3</gadget>
<output>63.84</output>

<result>63.84</result>