A, B, and C are participating in a 100-meter race. The speed ratio of A and B is 3:4, and the speed ratio of B and C is 5:4. When B runs to the finish line, how far is A from the finish line?
甲，乙，丙三人参加100米比赛，甲和乙的速度比3：4，乙和丙的速度比5：4，当乙跑到终点时，甲距终点多少米．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) * 100</gadget>
<output>75</output>

<gadget id="calculator">100 - 75</gadget>
<output>25</output>

<result>25</result>