An engineering team repairs a road with a length of 1500 meters. It is known that 600 meters were repaired in the first 4 days. According to this construction speed, how many days will it take to complete the task?
某工程队修一条长1500米的公路，已知前4天修了600米．照这样的施工速度，还要几天能完成任务？
<gadget id="calculator">1_500 - 600</gadget>
<output>900</output>

<gadget id="calculator">600 / 4</gadget>
<output>150</output>

<gadget id="calculator">900 / 150</gadget>
<output>6</output>

<result>6</result>