Xiao Ming went upstairs at a constant speed. It took him 50 seconds to go from the first floor to the third floor. He started to go upstairs from the first floor. After 125 seconds, how many floors did he reach?
小明匀速上楼，他从一楼上到三楼，用了50秒，他从一楼开始上楼，125秒后，他到了几楼？
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">125 / 25</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>