city holds a bicycle race around the city. The fastest cyclist meets the slowest cyclist 35 minutes after departure. It is known that the speed of the slowest cyclist is the speed of the fastest cyclist (5 /7), the circle around the city is 6km, find the speed of the fastest rider.
某城举行环城自行车赛，骑得最快的人在出发后35min就遇到骑得最慢的人，已知骑得最慢的人的车速是骑得最快的人的车速的(5/7)，环城一周是6km，求骑得最快的人的车速．
<gadget id="calculator">7 / 5</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">35 / 60</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">(7/5) * (7/12)</gadget>
<output>49/60 = around 0.816667</output>

<gadget id="calculator">(49/60) - (7/12)</gadget>
<output>7/30 = around 0.233333</output>

<gadget id="calculator">6 / (7/30)</gadget>
<output>180/7 = around 25.714286</output>

<gadget id="calculator">(180/7) * (7/5)</gadget>
<output>36</output>

<result>36</result>