It takes 5 days to build a 4-kilometer-long water canal, how much is the average amount of the water canal repaired every day.
修一条4千米长的水渠，5天修完，平均每天修这条水渠的多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>