To build a road, 1.8 kilometers were built on the first day, and 0.25 kilometers more were repaired on the second day than on the first day, leaving 1.36 kilometers to be repaired. How long is this road in kilometers?
修一条公路，第一天修了1.8千米，第二天比第一天多修0.25千米，还剩下1.36千米没有修．这条公路全长多少千米？
<gadget id="calculator">1.8 + 0.25 + 1.8 + 1.36</gadget>
<output>5.21</output>

<result>5.21</result>