The elder brother and the younger brother started from two places 2,400 meters apart and walked towards each other at the same time. The elder brother walked 170 meters per minute, and the younger brother walked 150 meters per minute. A puppy started with the elder brother at an average speed of 300 meters per minute. The elder brother and the younger brother kept running back and forth. When the older brother and younger brother met, how many meters did the puppy run in total?
哥哥和弟弟两人同时从相距2400米的两地出发相向而行，哥哥每分钟行170米，弟弟每分钟行150米，一只小狗与哥哥一起出发，以平均每分钟300米的速度在哥哥和弟弟之间不停地往返奔跑．当哥哥和弟弟相遇时，这只小狗一共跑了多少米？
<gadget id="calculator">170 + 150</gadget>
<output>320</output>

<gadget id="calculator">2_400 / 320</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">(15/2) * 300</gadget>
<output>2_250</output>

<result>2_250</result>