An express bus travels 315 kilometers in 3 hours, and an ordinary bus travels 320 kilometers in 4 hours. On average, how many kilometers does the express bus travel more per hour than the ordinary bus? (column comprehensive formula calculation)
一辆快客3小时行驶315千米，一辆普通客车4小时行驶320千米．快客平均每小时比普通客车多行驶多少千米？(列综合算式计算)
<gadget id="calculator">315 / 3</gadget>
<output>105</output>

<gadget id="calculator">320 / 4</gadget>
<output>80</output>

<gadget id="calculator">105 - 80</gadget>
<output>25</output>

<result>25</result>