How many hours does it take for a train to travel 800 km in 5 hours and travel 1280 km at the same speed?
一列火车5小时行驶800km，用同样的速度行驶1280km，需要多少小时？
<gadget id="calculator">800 / 5</gadget>
<output>160</output>

<gadget id="calculator">1_280 / 160</gadget>
<output>8</output>

<result>8</result>