To build a road, 36m was built on the first day, and 48m was built on the second day. The road was built in two days (4/15). How long is this road?
修一条路，第一天修了36m，第二天修了48m，两天共修了这条路的(4/15)，这条路有多长？
<gadget id="calculator">36 + 48</gadget>
<output>84</output>

<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">84 / (4/15)</gadget>
<output>315</output>

<result>315</result>