The road repair team repaired a road. It used to be 60 meters a day, but it has been repaired for 15 days. The remaining distance needs to be repaired by 20 meters a day, and it will take 30 days. How long is this road in meters?
修路队修一条路，原来每天修60米，已经修了15天，剩下的路程每天要多修20米，还要修30天，这条路全长多少米．
<gadget id="calculator">60 * 15</gadget>
<output>900</output>

<gadget id="calculator">60 + 20</gadget>
<output>80</output>

<gadget id="calculator">80 * 30</gadget>
<output>2_400</output>

<gadget id="calculator">900 + 2_400</gadget>
<output>3_300</output>

<result>3_300</result>