A road has been repaired (7/15) kilometers, and the rest is (2/5) kilometers longer than the already repaired one. How long is this road?
一条公路，已经修了(7/15)千米，剩下的比已经修了的多(2/5)千米，这条公路有多长？
<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(7/15) + (2/5) + (7/15)</gadget>
<output>4/3 = around 1.333333</output>

<result>4/3 = around 1.333333</result>