A convoy slowly crosses a 200-meter-long bridge at a speed of 4 m/s and takes 115 seconds. Q: How many meters does this convoy have?
一个车队以4米/秒的速度缓缓通过一座长200米的大桥，共用115秒．问：这个车队共有多少米？
<gadget id="calculator">4 * 115</gadget>
<output>460</output>

<gadget id="calculator">460 - 200</gadget>
<output>260</output>

<result>260</result>