On a highway, a car starts from city A at a speed of 50 kilometers per hour and travels towards city B in the east. People ride bicycles at the same speed. A happened to meet the car after traveling 3 kilometers, and then the car caught up with B for another 12 minutes. Find the total length of the road between A and B?
在一条公路上，汽车以每小时50千米的速度从A城出发朝东边的B城方向行驶，同时B城有甲、乙两人骑自行车分别向东西两个方向行进，而且甲、乙两人骑自行车速度相同．甲行了3千米后恰好与汽车相遇，此后汽车又行12分钟追上乙．求A、B之间的公路全长多少千米？
<gadget id="calculator">3 + 3</gadget>
<output>6</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">6 / (1/5)</gadget>
<output>30</output>

<gadget id="calculator">50 - 30</gadget>
<output>20</output>

<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">50 + 20</gadget>
<output>70</output>

<gadget id="calculator">(3/20) * 70</gadget>
<output>21/2 = around 10.5</output>

<result>21/2 = around 10.5</result>