The road between Qingdao and Tai'an is 364 kilometers long. Xiaoming's father drove from Qingdao to Tai'an. After driving for 4 hours, the distance to Tai'an was still 64 kilometers. How many kilometers per hour did the car drive on average?
青岛市距泰安市的公路长364千米，小明的爸爸驾车从青岛市前往泰安市，汽车行驶4小时后，距泰安市还有64千米，汽车平均每小时行驶多少千米？
<gadget id="calculator">364 - 64</gadget>
<output>300</output>

<gadget id="calculator">300 / 4</gadget>
<output>75</output>

<result>75</result>