From point A to point B, Xiao Ming travels 120 meters per branch, and can get there in 20 minutes. Now, in order to arrive 4 minutes earlier, how much more meters should he travel per minute than before?
从甲地到乙地，小明每分行120米，20分钟可以到达，现为了提前4分到达，这样每分钟应该比原来多行多少米？
<gadget id="calculator">20 - 4</gadget>
<output>16</output>

<gadget id="calculator">20 / 16</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">120 * (5/4)</gadget>
<output>150</output>

<gadget id="calculator">150 - 120</gadget>
<output>30</output>

<result>30</result>