In an off-road vehicle race, a car passes through a section of hillside, travels 600 meters per minute when going uphill, and takes 4 minutes to reach the top of the slope; travels 800 meters per hour when going downhill, and travels for 6 minutes. What is the average speed of this off-road vehicle uphill and downhill in meters per minute?
越野车比赛中，一辆车子经过一段山坡，上坡时每分钟行600米，用了4分钟到达坡顶；下坡时时速为每分钟行800米，行驶了6分钟．这辆越野车上坡和下坡的平均速度是每分钟多少米？
<gadget id="calculator">600 * 4</gadget>
<output>2_400</output>

<gadget id="calculator">800 * 6</gadget>
<output>4_800</output>

<gadget id="calculator">2_400 + 4_800</gadget>
<output>7_200</output>

<gadget id="calculator">4 + 6</gadget>
<output>10</output>

<gadget id="calculator">7_200 / 10</gadget>
<output>720</output>

<result>720</result>