Xiao Ming starts from home at 8 am, rides to the county seat, and arrives at 10 am. It is known that he is cycling at a speed of 15 km/h. How far is Xiao Ming's home from the county seat?
小明上午8时从家出发，骑车去县城，上午10时到达，已知他骑车的速度为15千米/时，小明家离县城有多远？
<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<result>30</result>