In a 60-meter race, A reaches the finish line 10 meters ahead of B and 20 meters ahead of C. If the speeds of B and C remain the same, when B reaches the finish line, how many meters will B be ahead of C?
在60米赛跑中，甲到达终点时领先乙10米，领先丙20米．如果乙和丙速度不变，当乙到达终点时，乙领先丙多少米．
<gadget id="calculator">60 - 10</gadget>
<output>50</output>

<gadget id="calculator">60 - 20</gadget>
<output>40</output>

<gadget id="calculator">50 / 40</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">1 / (5/4)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">60 * (4/5)</gadget>
<output>48</output>

<gadget id="calculator">60 - 48</gadget>
<output>12</output>

<result>12</result>