A passenger car travels a total of 86 kilometers in the first 2 hours and 37 kilometers per hour in the next 4 hours. How many kilometers per hour does it travel on average?
一辆客车前2小时共行驶86千米，后4小时每小时行驶37千米，平均每小时行驶多少千米？
<gadget id="calculator">4 * 37</gadget>
<output>148</output>

<gadget id="calculator">86 + 148</gadget>
<output>234</output>

<gadget id="calculator">2 + 4</gadget>
<output>6</output>

<gadget id="calculator">234 / 6</gadget>
<output>39</output>

<result>39</result>