A road construction team paved a section of railway. The original plan was to pave 3.2 kilometers per day, and it took 15 days to complete the paving. The actual pavement was 0.8 kilometers more than the original plan every day. How many days will it take to complete this section of railway? (Solve with ratio)
一个筑路队铺一段铁路，原计划每天铺3.2千米，15天铺完，实际每天比原计划每多铺0.8千米，多少天就能铺完这段铁路？(用比例解)
<gadget id="calculator">3.2 * 15</gadget>
<output>48</output>

<gadget id="calculator">3.2 + 0.8</gadget>
<output>4</output>

<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<result>12</result>