car is going from A to B. First drive on a flat road at a speed of 80 km/h for 2.5 hours, and then drive on an uphill road at a speed of 68 km/h for 0.5 hours to reach point B. What is the average speed of this car?
一辆汽车要从甲地开往乙地．先用80千米/时的速度在平路上行驶了2.5小时，然后用68千米/时的速度在上坡路上行驶了0.5小时到达乙地．问这辆车的平均速度是多少？
<gadget id="calculator">80 * 2.5</gadget>
<output>200</output>

<gadget id="calculator">68 * 0.5</gadget>
<output>34</output>

<gadget id="calculator">200 + 34</gadget>
<output>234</output>

<gadget id="calculator">2.5 + 0.5</gadget>
<output>3</output>

<gadget id="calculator">234 / 3</gadget>
<output>78</output>

<result>78</result>