A car travels 40 kilometers per hour, and a bicycle takes 2.5 minutes longer to travel 1 kilometer than a car. What percentage of the speed of the bicycle is the speed of the car?
一辆汽车每小时行40千米，自行车每行1千米比汽车多用2.5分钟，自行车速度是汽车速度的百分之几？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

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

<gadget id="calculator">15 / 40</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>