1800 cubic meters of soil can be excavated in 4.5 hours with 5 excavators. According to this calculation, how many hours will it take to complete the task of digging 6,400 cubic meters of soil with 8 excavators?
用5台挖土机4.5小时可以挖土1800立方米．照这样计算，用8台挖土机完成丢完成挖土6400立方米的任务，需要多少小时？
<gadget id="calculator">1_800 / 5 / 4.5</gadget>
<output>80</output>

<gadget id="calculator">80 * 8</gadget>
<output>640</output>

<gadget id="calculator">6_400 / 640</gadget>
<output>10</output>

<result>10</result>