The dog chases the rabbit, the dog takes one step forward 2.8 meters, the rabbit takes one step forward 1.7 meters, every time the dog runs 2 steps, the rabbit runs exactly 3 steps. If the distance between the rabbit and the dog is 50 meters, when the dog catches up with the rabbit, how many meters did the rabbit run?
狗追兔子，狗跑一步前进2.8公尺，兔子跑一步前进1.7公尺，每当狗跑2步时，兔子恰好跑了3步．如果兔子和狗的距离是50公尺，当狗追上兔子时，兔子跑了多少公尺﹖
<gadget id="calculator">2.8 * 2</gadget>
<output>5.6</output>

<gadget id="calculator">1.7 * 3</gadget>
<output>5.1</output>

<gadget id="calculator">5.6 - 5.1</gadget>
<output>0.5</output>

<gadget id="calculator">50 / 0.5</gadget>
<output>100</output>

<gadget id="calculator">100 * 3 * 1.7</gadget>
<output>510</output>

<result>510</result>