A section of the road needs repairs, and road workers have erected some cone-shaped barricades. The diameter of the bottom surface of each cone is 50cm. There are 15 cones in total. The distance between every two cones is 1.5m. How many meters are there from the first roadblock to the last one?
有一段路需要维修，道路施工人员摆了一些圆锥形路障．每个圆锥的底面直径为50cm，一共摆了15个，每两个圆锥间距离是1.5m，从第一个路障到最后一个共多少米？
<gadget id="calculator">15 - 1</gadget>
<output>14</output>

<gadget id="calculator">14 * 1.5</gadget>
<output>21</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 15</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">21 + (15/2)</gadget>
<output>57/2 = around 28.5</output>

<result>57/2 = around 28.5</result>