The distance between the two places is 81 kilometers. Two people A and B ride towards each other from the two places at the same time. A rides 10 kilometers per hour. The two meet after 4.5 hours. How much faster is A than B?
两地相距81千米，甲、乙两人同时从两地骑车相向而行，甲每小时骑10千米，两人4.5小时后相遇．甲的速度比乙快百分之几？
<gadget id="calculator">81 / 4.5</gadget>
<output>18</output>

<gadget id="calculator">18 - 10</gadget>
<output>8</output>

<gadget id="calculator">10 - 8</gadget>
<output>2</output>

<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

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