The engineering team originally planned to complete a 420-kilometer road in 28 days, but it actually needs to build an extra 5 kilometers a day. How many kilometers does it actually need to repair every day?
工程队原计划28天修完一条长420千米的公路，实际每天要多修5千米，实际每天修多少千米？
<gadget id="calculator">420 / 28</gadget>
<output>15</output>

<gadget id="calculator">15 + 5</gadget>
<output>20</output>

<result>20</result>