To build a 30-kilometer branch road, the full-length (1/3) was built in the first week, and the full-length (3/5) was built in the second week. How many kilometers were built in two weeks?
修一条30千米的分路，第一周修了全长的(1/3)，第二周修了全长的(3/5)，两周一共修了多少千米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">30 * (1/3)</gadget>
<output>10</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">30 * (3/5)</gadget>
<output>18</output>

<gadget id="calculator">10 + 18</gadget>
<output>28</output>

<result>28</result>