It took 115 seconds for a train to cross a 200-meter-long bridge at a speed of 4 meters per second. It is known that each car is 5 meters long and the distance between two adjacent cars is 10 meters. Q: How many cars are there in this fleet?
一列车队以每秒4米的速度缓缓通过一座长200米的大桥，用了115秒．已知每辆车长5米，相邻两车相距10米．问：这个车队共有多少辆车？
<gadget id="calculator">4 * 115</gadget>
<output>460</output>

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

<gadget id="calculator">10 + 260</gadget>
<output>270</output>

<gadget id="calculator">5 + 10</gadget>
<output>15</output>

<gadget id="calculator">270 / 15</gadget>
<output>18</output>

<result>18</result>