Xiao Ming and Xiao Li are standing back to back. Xiao Ming walks 100 meters to the north, and Xiao Li walks 120 meters to the south. How far is the distance between them?
小明和小立背对背站立，小明向北走100米，小立向南走120米，此时两人相距多远？
<gadget id="calculator">100 + 120</gadget>
<output>220</output>

<result>220</result>