A construction team repaired a 31.5-kilometer road. It was originally planned to be completed in 20 days, but it was actually completed in 18 days. How many kilometers are actually repaired every day?
某工程队修一条长31.5千米的公路，原计划20天完成，实际18天就完成了．实际每天多修多少千米．
<gadget id="calculator">31.5 / 18</gadget>
<output>1.75</output>

<gadget id="calculator">31.5 / 20</gadget>
<output>1.575</output>

<gadget id="calculator">1.75 - 1.575</gadget>
<output>0.175</output>

<result>0.175</result>