Students from class 4 and class 1 are in physical education class, 15 people stand in a horizontal row, and the distance between each two people is 2 meters. How long is this row?
四1班同学上体育课，15人站成一横排，每两人之间是2米．这一横排有多长？
<gadget id="calculator">15 - 1</gadget>
<output>14</output>

<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<result>28</result>