A and B practice running on a circular road. A runs 195 meters per minute, and B runs 225 meters per minute. The two start at the same time and run in the same direction. B runs in 28 minutes to catch up with A; Start from the ground, run with your back, and meet as many times as you want.
甲乙二人在一个环形道路上练习跑步，甲每分钟跑195米，乙每分钟跑225米，两人同时同地出发，同向而跑，乙跑28分钟追上甲；如果两人同时同地出发，背向而跑，就多少相遇．
<gadget id="calculator">225 * 28</gadget>
<output>6_300</output>

<gadget id="calculator">195 * 28</gadget>
<output>5_460</output>

<gadget id="calculator">6_300 - 5_460</gadget>
<output>840</output>

<gadget id="calculator">195 + 225</gadget>
<output>420</output>

<gadget id="calculator">840 / 420</gadget>
<output>2</output>

<result>2</result>