The train passed a 2,700-meter-long bridge, and it took 3 minutes from the front of the train to the bridge to the rear of the train. It is known that the speed of the train is 1000 meters per minute, how many meters is the length of the train body?
列车通过一座长2700米的大桥，从车头上桥到车尾离桥共用了3分钟．已知列车的速度是每分钟1000米，列车车身长多少米？
<gadget id="calculator">1_000 * 3</gadget>
<output>3_000</output>

<gadget id="calculator">3_000 - 2_700</gadget>
<output>300</output>

<result>300</result>