An airplane can fly for up to 6 hours with the fuel it carries. When it flies out, it can fly 1200 kilometers per hour with the wind, and when it returns, it can fly 960 kilometers per hour against the wind.
一种飞机所带的燃料最多可飞行6小时，飞出时顺风每小时飞行1200千米，返回时逆风每小时飞行960千米，这架飞机最多可飞出多少千米就应往回飞．
<gadget id="calculator">1 / 1_200</gadget>
<output>1/1_200 = around 0.000833</output>

<gadget id="calculator">1 / 960</gadget>
<output>1/960 = around 0.001042</output>

<gadget id="calculator">(1/1_200) + (1/960)</gadget>
<output>3/1_600 = around 0.001875</output>

<gadget id="calculator">6 / (3/1_600)</gadget>
<output>3_200</output>

<result>3_200</result>