There are 30 students standing in a row on the playground. The distance between every two students is 0.6 meters. What is the distance from the head to the end of the row?
操场上30名同学站成一列，每两个人之间的距离是0.6米，排头到排尾的距离是多少米．
<gadget id="calculator">30 - 1</gadget>
<output>29</output>

<gadget id="calculator">0.6 * 29</gadget>
<output>17.4</output>

<result>17.4</result>