A car travels an average of 70 kilometers per hour in the first 5 hours, and an average of 35 kilometers per hour in the next 2 hours. How many kilometers per hour does the car travel on average?
一辆汽车前5小时平均每小时行70千米，后2小时平均每小时行35千米，这辆汽车平均每小时行多少千米？
<gadget id="calculator">70 * 5</gadget>
<output>350</output>

<gadget id="calculator">35 * 2</gadget>
<output>70</output>

<gadget id="calculator">350 + 70</gadget>
<output>420</output>

<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<gadget id="calculator">420 / 7</gadget>
<output>60</output>

<result>60</result>