car travels 3 kilometers in 6 minutes in the urban area. After leaving the urban area, the speed increases to 750 meters per minute. After driving in this way, it takes 24 minutes to reach the destination. How many meters per minute does the car travel on average?
一辆汽车先在市区行驶6分钟行了3千米，出市区后速度增加到每分钟750米，这样再行驶了24分钟达到了目的地，这辆汽车平均每分钟行驶多少米？
<gadget id="calculator">3 * 1_000</gadget>
<output>3_000</output>

<gadget id="calculator">750 * 24</gadget>
<output>18_000</output>

<gadget id="calculator">3_000 + 18_000</gadget>
<output>21_000</output>

<gadget id="calculator">6 + 24</gadget>
<output>30</output>

<gadget id="calculator">21_000 / 30</gadget>
<output>700</output>

<result>700</result>