Two teams of students, A and B, start from two places 17 kilometers apart and head towards each other. A student rides a bicycle to communicate back and forth between the two places at a speed of 3.5 kilometers per quarter of an hour (stopping time is not counted). If the students of team A walk 4.5 kilometers per hour, and the students of team B walk 4 kilometers per hour, how many kilometers did the students on bicycles walk when the two teams met?
甲、乙两队学生从相距17千米的两地出发，相向而行，一个同学骑自行车以每刻钟3.5千米的速度在两地之间往返联络(停歇时间不计)．如果甲队学生每小时走4.5千米，乙队学生每小时走4千米，问两队学生相遇时，骑自行车的学生共走多少千米？
<gadget id="calculator">4.5 + 4</gadget>
<output>8.5</output>

<gadget id="calculator">17 / 8.5</gadget>
<output>2</output>

<gadget id="calculator">3.5 * 4</gadget>
<output>14</output>

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

<result>28</result>