The distance between A and B is 378 kilometers. A car travels from A to B. It takes 4.5 hours to go there and 4 hours to return. How much more kilometers per hour is traveled when returning than when going?
甲乙两地相距378千米，一辆汽车从甲地开往乙地，去时用了4.5小时，返回用了4小时，返回时比去时每小时多行多少千米？
<gadget id="calculator">378 / 4</gadget>
<output>189/2 = around 94.5</output>

<gadget id="calculator">378 / 4.5</gadget>
<output>84</output>

<gadget id="calculator">(189/2) - 84</gadget>
<output>21/2 = around 10.5</output>

<result>21/2 = around 10.5</result>