The speed of a high-speed train is 350 kilometers per hour, which is 130 kilometers less than that of a helicopter (5/7). How many kilometers per hour is the speed of a helicopter?
一架高速列车的时速是350千米，比一架直升飞机的(5/7)少130千米，一架直升飞机的时速是多少千米？
<gadget id="calculator">130 + 350</gadget>
<output>480</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">480 / (5/7)</gadget>
<output>672</output>

<result>672</result>