reinforced company of the People's Liberation Army with 256 people crossed a bridge in a four-way column. It took 15 minutes from the first row of the team to the bridge to the last row of the team leaving the bridge. It is known that the front and rear rows of the team are 2 meters apart, and the speed of travel is 55 meters per minute. Find the length of the bridge.
解放军一个加强连256人排成四路纵队过一座桥，从队伍第一排上桥到队伍最后一排离开桥共用了15分钟．已知队伍前后两排相距2米，行进的速度是每分钟55米，求桥的长度．
<gadget id="calculator">55 * 15</gadget>
<output>825</output>

<gadget id="calculator">256 / 4</gadget>
<output>64</output>

<gadget id="calculator">64 - 1</gadget>
<output>63</output>

<gadget id="calculator">63 * 2</gadget>
<output>126</output>

<gadget id="calculator">825 - 126</gadget>
<output>699</output>

<result>699</result>