The fuel carried by an aircraft can be used for up to 6 hours. The aircraft can fly 750 kilometers per hour when it goes with the wind, and it can fly 600 kilometers per hour when it flies back. Fly back?
一架飞机所带的燃料最多可以用6小时，飞机去是顺风，每小时可以飞行750千米，飞回时逆风每小时可以飞600千米，这架飞机最多飞出多少千米，就需要往回飞？
<gadget id="calculator">750 * 6</gadget>
<output>4_500</output>

<gadget id="calculator">600 + 750</gadget>
<output>1_350</output>

<gadget id="calculator">4_500 / 1_350</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">600 * (10/3)</gadget>
<output>2_000</output>

<result>2_000</result>