16 students line up to do exercises, with a distance of 2 meters between each two. How many meters is the distance between the first student and the last student?
16名同学排成一队做操，每两人之间相隔2米．第一名同学与最后一名同学之间相距多少米？
<gadget id="calculator">16 - 1</gadget>
<output>15</output>

<gadget id="calculator">2 * 15</gadget>
<output>30</output>

<result>30</result>