The distance between A and B is 425 kilometers. A car has traveled 173 kilometers from A to B, and it will take 6 hours to get there. How many kilometers per hour on average?
甲、乙两地相距425千米，一辆汽车从甲地到乙地，已经行了173千米，还要行驶6小时才能到达，平均每小时行驶多少千米？
<gadget id="calculator">425 - 173</gadget>
<output>252</output>

<gadget id="calculator">252 / 6</gadget>
<output>42</output>

<result>42</result>