A car drives from place A to place B. It travels 42 kilometers per hour in the first 3 hours, and the remaining 165 kilometers takes 4 hours and 30 minutes to complete. On average, how many kilometers per hour does the car travel from A to B?
一辆汽车从甲地开往乙地，前3小时每小时行42千米，余下的165千米共用4小时30分走完．这辆汽车从甲地到乙地平均每小时走多少千米？
<gadget id="calculator">42 * 3</gadget>
<output>126</output>

<gadget id="calculator">126 + 165</gadget>
<output>291</output>

<gadget id="calculator">3 + 4.5</gadget>
<output>7.5</output>

<gadget id="calculator">291 / 7.5</gadget>
<output>38.8</output>

<result>38.8</result>