The top speed of a "high-speed rail" train is 350 kilometers per hour, the top speed of a "high-speed train" is its (5/7), and the top speed of a "high-speed train" is (5/3) of an express train. What is the top speed of an express train in kilometers per hour?
一列"高铁"火车的最高时速是350千米，"动车"的最高时速是它的(5/7)，"动车"的最高时速是特快火车的(5/3)．一列特快火车的最高时速是多少千米？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

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

<gadget id="calculator">(5/7) / (5/3)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">350 * (3/7)</gadget>
<output>150</output>

<result>150</result>