To build a road, it was planned to build 60 meters per day, but actually built 15 meters more per day, and the result was completed 4 days ahead of schedule. How many meters were built in total?
修一条公路，计划每天修60米，实际每天多修15米，结果提前4天修完，一共修了多少米？
<gadget id="calculator">4 * 60</gadget>
<output>240</output>

<gadget id="calculator">4 * 15</gadget>
<output>60</output>

<gadget id="calculator">240 + 60</gadget>
<output>300</output>

<gadget id="calculator">1 / 60</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">(1/60) * 60</gadget>
<output>1</output>

<gadget id="calculator">(1/60) * 15</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) - 1</gadget>
<output>-3/4 = around -0.75</output>

<gadget id="calculator">1 + (-3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">300 / (1/4)</gadget>
<output>1_200</output>

<result>1_200</result>