A car travels 60 kilometers per hour from place A to place B, and it takes 5 hours. Now it travels 15 kilometers more per hour than before. How many hours earlier can it arrive at place B?
一辆汽车从甲地到乙地，每小时行60千米，需要5小时，现在每小时比原来多行15千米，可提前几小时到达乙地？
<gadget id="calculator">60 + 15</gadget>
<output>75</output>

<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>