In the 50-meter sprint, A takes 15 seconds and B takes 12 seconds. How much slower is A's speed than B's speed.
50米短跑，甲需要15秒，乙需要12秒．甲的速度比乙的速度慢多少．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

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