The speed of a high-speed train is 350km per hour, which is slower (5/12) than that of a helicopter. How many kilometers per hour is the speed of a helicopter?
一列高速列车的时速是350km，比一架直升飞机的速度慢(5/12)，一架直升飞机的时速是多少千米？
<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">1 - (5/12)</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">350 / (7/12)</gadget>
<output>600</output>

<result>600</result>