Build a road with a length of (4/5) kilometers, and (1/4) of it was repaired in 3 days. How many miles per day on average?
修一条长为(4/5)千米的道路，3天修了它的(1/4)．平均每天修多少千米？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 3</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(4/5) * (1/12)</gadget>
<output>1/15 = around 0.066667</output>

<result>1/15 = around 0.066667</result>