An engineering team repaired a section of railway, and built 225 meters in the first 3 days. According to this calculation, it can be completed in 4 days. How long is this track in meters?
某工程队修一段铁路，前3天修了225米，照这样计算，再修4天就可以修完．这段铁路共长多少米．
<gadget id="calculator">225 / 3</gadget>
<output>75</output>

<gadget id="calculator">75 * 4</gadget>
<output>300</output>

<gadget id="calculator">225 + 300</gadget>
<output>525</output>

<result>525</result>