Xiaohong walks to school from home, walking 60 meters per minute. After walking for ten minutes, her father rides a bicycle from home to chase Xiaohong, and finally catches up with Xiaohong 900 meters away from home. How many meters does dad walk per minute?
小红从家步行去上学，每分钟走60米，走了十分钟后，爸爸从家骑自行车去追小红，结果在距家900米的地方追上小红．爸爸每分钟行多少米？
<gadget id="calculator">60 * 10</gadget>
<output>600</output>

<gadget id="calculator">900 - 600</gadget>
<output>300</output>

<gadget id="calculator">300 / 60</gadget>
<output>5</output>

<gadget id="calculator">900 / 5</gadget>
<output>180</output>

<result>180</result>