Xiaoming's house, Xiaohong's house and the school are on the same road. Xiaoming's home is 637 meters away from the school, and Xiaohong's home is 248 meters away from the school. How far is the minimum distance from Xiao Ming's house to Xiao Hong's house?
小明家、小红家和学校在同一条路上．小明家到学校有637米，小红家到学校有248米．小明家到小红家最少有多远？
<gadget id="calculator">637 - 248</gadget>
<output>389</output>

<result>389</result>