The home of the big-headed son is 3,000 meters away from the school. The little-headed father goes from home to pick up the big-headed son from school. The big-headed son returns home from school. They set off at the same time. The small-headed father walks 24 meters more than the big-headed son every minute. After 50 minutes, the two Meet, then what is the speed of the big head son.
大头儿子的家距离学校3000米，小头爸爸从家去学校接大头儿子放学，大头儿子从学校回家，他们同时出发，小头爸爸每分钟比大头儿子多走24米，50分钟后两人相遇，那么大头儿子的速度是多少．
<gadget id="calculator">3_000 / 50</gadget>
<output>60</output>

<gadget id="calculator">60 - 24</gadget>
<output>36</output>

<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<result>18</result>