Fill an empty swimming pool with a length of 50 meters, a width of 25 meters and a depth of 1.6 meters. After 0.6 hours, the water depth will reach 0.2 meters. According to this calculation, how many hours will it take to fill the swimming pool? (Answer with proportional knowledge)
向一个长50米、宽25米、深1.6米的空游泳池里注水，经过0.6小时后水深达0.2米．照这样计算，共需几小时能把这个游泳池注满？(用比例知识解答)
<gadget id="calculator">50 * 25 * 1.6</gadget>
<output>2_000</output>

<gadget id="calculator">50 * 25 * 0.2</gadget>
<output>250</output>

<gadget id="calculator">2_000 / 250</gadget>
<output>8</output>

<gadget id="calculator">8 * 0.6</gadget>
<output>4.8</output>

<result>4.8</result>