A car travels 40 kilometers per hour from place A to place B, and returns 10 kilometers per hour faster, by what percentage?
一辆汽车从甲地去乙地每小时行40千米，返回时每小时快10千米，速度提高了几分之几？
<gadget id="calculator">10 / 40</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>