The construction team built a viewing trail, completed 30% of the total length in the first week, and completed 45% of the total length in the second week. A total of 150 meters has been built in two weeks. How long is this trail in meters?
工程队修一条观赏步道，第一周完成了全长的30%，第二周完成了全长的45%．两周共修150米，这条步道全长多少米？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">(3/10) + (9/20)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">150 / (3/4)</gadget>
<output>200</output>

<result>200</result>