A car travels a total of 315 meters from 9 o'clock to 12 o'clock, how many meters per hour on average?
一辆汽车从9时到12时一共行315米，平均每小时行多少米？
<gadget id="calculator">12 - 9</gadget>
<output>3</output>

<gadget id="calculator">315 / 3</gadget>
<output>105</output>

<result>105</result>