A wire is built from the county seat to Shengli Village, which is 7200 meters long. After 3 days of erection, there is still 2,400 meters away from Shengli Village. How many meters are erected per day on average?
从县城架一条电线到胜利村，长7200米．架了3天以后，离胜利村还有2400米，平均每天架了多少米？
<gadget id="calculator">7_200 - 2_400</gadget>
<output>4_800</output>

<gadget id="calculator">4_800 / 3</gadget>
<output>1_600</output>

<result>1_600</result>