Xiao Zhang and Xiao Li are running on a circular track. They start from the same place and walk in opposite directions. Xiao Zhang's running speed is 5 m/s, Xiao Li's running speed is 6 m/s, and they meet after 40 seconds. How many meters is the runway long?
小张和小李在环形跑道上跑步，两人从同一地点出发，反向而行．小张跑步的速度是5米/秒，小李跑步的速度是6米/秒，经过40秒两人相遇．跑道长多少米？
<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<gadget id="calculator">11 * 40</gadget>
<output>440</output>

<result>440</result>