loom started weaving 48 meters of cloth in 4 hours, and then weaved another 72 meters at the same speed. How many hours did it take to weave the cloth?
一台织布机，开始4小时织布48米，后来以同样的速度又织了72米，织完这些布共用了多少小时？
<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<gadget id="calculator">72 / 12</gadget>
<output>6</output>

<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<result>10</result>