A loom weaves 18.4m of cloth in 4 hours. According to this calculation, how many hours will it take to weave 57.5m of cloth?
一台织布机4小时织布18.4m，照这样计算，要织57.5m布，需要多少小时？
<gadget id="calculator">18.4 / 4</gadget>
<output>4.6</output>

<gadget id="calculator">57.5 / 4.6</gadget>
<output>12.5</output>

<result>12.5</result>