The weaving workshop can weave 3,500 meters of cloth in 2.5 hours. With this efficiency, how many hours can we weave 9,800 meters of cloth?
织布车间2.5小时织布3500米，照这样效率，织9800米布，几小时可以完成？
<gadget id="calculator">3_500 / 2.5</gadget>
<output>1_400</output>

<gadget id="calculator">9_800 / 1_400</gadget>
<output>7</output>

<result>7</result>