The Air Force rescued the affected villagers and dropped a batch of supplies. The plane originally planned to fly 15 kilometers per minute, but actually flew 20 kilometers per minute, so the plane arrived at the airdrop site 12 minutes earlier than originally planned. How many kilometers is the airport from the airdrop site?
空军抢救受灾的村民，空投一批物资．飞机原计划每分飞行15千米，实际每分飞行20千米，这样飞机比原计划早12分到达空投地点．飞机场距离空投地点多少千米？
<gadget id="calculator">20 * 12</gadget>
<output>240</output>

<gadget id="calculator">20 - 15</gadget>
<output>5</output>

<gadget id="calculator">240 / 5</gadget>
<output>48</output>

<gadget id="calculator">48 * 15</gadget>
<output>720</output>

<result>720</result>