The convoy will transport 1,500 tons of relief materials to the disaster area, and 300 tons will be transported to the disaster area in the first 5 hours. At this speed, how many hours will it take for the remaining relief supplies to be transported to the disaster area?
车队要向灾区运送1500吨救灾物资，前5小时运到灾区300吨．照这样的速度，剩下的救灾物资还要多少小时才全部运到灾区？
<gadget id="calculator">1_500 - 300</gadget>
<output>1_200</output>

<gadget id="calculator">5 * 1_200</gadget>
<output>6_000</output>

<gadget id="calculator">6_000 / 300</gadget>
<output>20</output>

<result>20</result>