Xiao Ming's home is 200 meters south of the school, which is recorded as +200 meters. Now he walks north from his home, and his position can be expressed in meters after walking 120 meters per minute for 3 minutes.
小明家在学校南面200米处，记作+200米，现在他从家往北走，每分钟走120米3分钟后他所在的位置可以表示为多少米．
<gadget id="calculator">120 * 3</gadget>
<output>360</output>

<gadget id="calculator">360 - 200</gadget>
<output>160</output>

<result>160</result>