A 3 km road is repaired in 7 days, how much of this road is repaired every day
一条3千米的公路7天修完，每天修了这条路的多少
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<result>1/7 = around 0.142857</result>