A and B are in a 100-meter race. When B reaches the finish line, A has just walked to the 90-meter mark. If you compare again, A is still at the original starting point, let B start 10 meters behind A, and the two start at the same time, how many meters ahead will the winner arrive at?
A与B进行百米竞走比赛，B到终点时，A刚走到90米处．如果再比一次，A仍在原来起点，让B在A后面10米处作起点，两人同时出发，获胜者到达时领先多少米．
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">10 * (9/10)</gadget>
<output>9</output>

<gadget id="calculator">90 + 9</gadget>
<output>99</output>

<gadget id="calculator">100 - 99</gadget>
<output>1</output>

<result>1</result>