Athletes A and B practice cycling on the training ground. They set off at the same time. A travels 6 meters more than B per minute. After 4 minutes, A arrives at the designated place and returns immediately. He met B at a distance of 15 meters from the designated point. , How long is this training route?
运动员甲、乙两人在训练场练习骑车，两人同时出发，甲每分钟比乙多行6米，经过4分钟甲到达指定地点后立即返回，在距离指定点15米处遇到过乙，问这段训练的路线有多长？
<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">24 - 15</gadget>
<output>9</output>

<gadget id="calculator">15 / 9</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">1 / (5/3)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">6 / (2/5)</gadget>
<output>15</output>

<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<result>60</result>