A, B, and C start from the same starting point at the same time, and perform a non-stop walking competition at a constant speed. B walks 12 meters less than A and 3 meters longer than C every minute. When B reaches the finish line, he arrives 9 minutes later than A and 3 minutes earlier than C. How many meters is the whole distance of this walking race?
甲、乙、丙三人同时从同一个出发点出发，进行不间断匀速步行比赛，每分钟乙比甲少走12米，而比丙多走3米．当乙到达终点时，比甲晚到9分钟，而比丙早到3分钟．这次步行比赛全程是多少米？
<gadget id="calculator">60 - 12</gadget>
<output>48</output>

<gadget id="calculator">60 * 9</gadget>
<output>540</output>

<gadget id="calculator">540 / 12</gadget>
<output>45</output>

<gadget id="calculator">48 * 45</gadget>
<output>2_160</output>

<result>2_160</result>