In the Olympic triathlon, the distance of the bicycle race is 4 times that of the long-distance running, and the distance of swimming is 3/8 of that of a bicycle. The difference between the distance of long-distance running and swimming is 8.5 kilometers. ．
在奥运会的铁人三项比赛中，自行车比赛的距离是长跑的4倍，游泳的距离是自行车的(3/8)，长跑与游泳的距离之差为8.5千米，长跑的距离是多少千米．
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(3/8) - (1/4)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">8.5 / (1/8)</gadget>
<output>68</output>

<gadget id="calculator">68 * (1/4)</gadget>
<output>17</output>

<result>17</result>