The fuel carried by a plane can be used for up to 6 hours. When the plane goes with the wind, it can fly 1500 kilometers per hour. When it flies back, it can fly 1200 kilometers per hour. fly.
一架飞机所带的燃料最多可以用6小时，飞机去时顺风，每小时可以飞1500公里，飞回时逆风，每小时可以飞1200公里，这架飞机最多飞出多少公里，就需往回飞．
<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1_500 * 6 * (4/9)</gadget>
<output>4_000</output>

<result>4_000</result>