Earthquake relief, united as one. A certain factory accepted the production task of "producing 2400 tents in 25 hours". In fact, the factory produced 720 in the first 6 hours. Based on this calculation, how many hours does the factory need to complete the production task? (Solution with proportional knowledge)
抗震救灾，众志成城．某工厂接受了"25小时生产2400顶帐蓬"的生产任务．实际上，这间工厂前6小时就生产了720顶，照这样计算，这间工厂只需要多少小时就能完成生产任务？(用比例知识解)
<gadget id="calculator">2_400 * 6</gadget>
<output>14_400</output>

<gadget id="calculator">14_400 / 720</gadget>
<output>20</output>

<result>20</result>