Xiao Ming’s home is about 6,300 meters away from the park. On Sunday, it took Dad 20 minutes to take Xiao Ming to the park by tram, and he arrived home 5 minutes earlier than when he came back from the park. When returning, how many meters did Dad’s tram travel on average per minute?
小明家离公园大约是6300米，星期天，爸爸骑电车带小明去公园用了20分钟，从公园回来比去时提前了5分钟到家，返回时，爸爸的电车平均每分钟行了多少米？
<gadget id="calculator">20 - 5</gadget>
<output>15</output>

<gadget id="calculator">6_300 / 15</gadget>
<output>420</output>

<result>420</result>