Two brothers and sisters are playing by a circular pool with a circumference of 60 meters. They walk around the pool at the same time from the same place. The elder brother walks 3 meters per second, and the younger sister walks 2 meters per second. How many meters do you have to walk to get back to the starting point?
兄妹二人在周长60米的圆形水池边玩，从同一地点同时背向绕水池而行，兄每秒走3米，妹每秒走2米，他们第8次相遇时，哥哥还需走多少米，才能回到出发点？
<gadget id="calculator">60 * 5</gadget>
<output>300</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">60 / 5</gadget>
<output>12</output>

<gadget id="calculator">12 * 8 * 3</gadget>
<output>288</output>

<gadget id="calculator">300 - 288</gadget>
<output>12</output>

<result>12</result>