Xiao Ming went to school with his younger sister. When Xiao Ming arrived at school, he found that he had forgotten his books and immediately went home to get them. He met his younger sister when he was 180 meters away from the school. Xiao Ming’s branch is 90 meters away, and his sister’s branch is 60 meters away. How far is the distance between home and school?
小明和妹妹一起去学校，小明到学校时发现书本忘带了马上回家拿，在距学校180米时遇到妹妹．小明每分行90米，妹妹每分行60米，家距学校多少米．
<gadget id="calculator">90 - 60</gadget>
<output>30</output>

<gadget id="calculator">2 / 30</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">180 * (1/15)</gadget>
<output>12</output>

<gadget id="calculator">60 * 12</gadget>
<output>720</output>

<gadget id="calculator">720 + 180</gadget>
<output>900</output>

<result>900</result>