There are 160 fourth-grade students lined up in a four-way column (that is, 40 students in each row), and the distance between two adjacent rows is 1 meter. What is the total length of the column?
四年级学生160个人排成四路纵队(即每排40个人)，每相邻两排间相隔1米，那么这纵队队伍共长多少米．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 * 1</gadget>
<output>3</output>

<result>3</result>