The speed of a high-speed train is 350km per hour, which is slower (1/2) 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，比一架直升机的速度慢(1/2)，一架直升机的时速是多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">350 / (1/2)</gadget>
<output>700</output>

<result>700</result>