The cyclist departs from the starting station of No. 102 tram at a speed of 300 meters per minute and advances along the No. 102 tram line. When the cyclist leaves the starting point for 2100 meters, a No. 102 tram leaves the starting station. A tram travels 500 meters per minute, arrives at a stop in 5 minutes and stops for 1 minute. So how many minutes does it take for the tram to catch up with the cyclist?
骑车人以每分钟300米的速度，从102路电车始发站出发，沿102路电车线前进，骑车人离开出发地2100米时，一辆102路电车开出了始发站，这辆电车每分钟行500米，行5分钟到达一站并停车1分钟．那么需要多少分钟，电车追上骑车人．
<gadget id="calculator">2_100 / 200</gadget>
<output>21/2 = around 10.5</output>

<gadget id="calculator">1 * 2</gadget>
<output>2</output>

<gadget id="calculator">300 * 2</gadget>
<output>600</output>

<gadget id="calculator">600 / 200</gadget>
<output>3</output>

<gadget id="calculator">(21/2) + 2 + 3</gadget>
<output>31/2 = around 15.5</output>

<result>31/2 = around 15.5</result>