From A to B, travel 60 kilometers per hour and arrive in 5 hours. If you travel 75 kilometers per hour, how many hours can you arrive in advance?
从甲地到乙地，每小时行60千米，5小时到达．如果每小时行75千米，可以提前几小时到达？
<gadget id="calculator">5 / 75</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">60 * (1/15)</gadget>
<output>4</output>

<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<result>1</result>