It takes Xiao Ming 15 minutes to walk to his grandma's house. His house is 900 meters away from his grandma's house. What is Xiao Ming's speed?
小明步行去奶奶家需要15分钟，他家距奶奶家有900米，小明的速度是多少．
<gadget id="calculator">900 / 15</gadget>
<output>60</output>

<result>60</result>