A section of the road is (7/8) kilometers long. The worker uncle repaired the full length (1/4) on the first day, and the full length (2/5) on the second day, and the rest on the third day, and the third day. How much is the total length.
一段路长(7/8)千米，工人叔叔第一天修了全长的(1/4)，第二天修了全长的(2/5)，其余的第三天修，第三天修了全长的多少．
<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<result>7/15 = around 0.466667</result>