The distance between A and B is 3150 kilometers. It takes 15 hours for a car to drive from A to B, which is exactly half of the journey. How many kilometers does this car travel on average per hour?
甲乙两地相距3150千米，一辆汽车从甲地开往乙地用了15小时，正好行了全程的一半，问这辆汽车平均每小时行多少千米？
<gadget id="calculator">3_150 / 2 / 15</gadget>
<output>105</output>

<result>105</result>