Two people, A and B, are swimming in the river, starting from somewhere one after another, and swimming towards the same direction at the same speed. Now A is in front of B, and B is 20 meters away from the starting point. When B swims to A's current position, A will move 98 meters away from the starting point. Question: How far is A from the starting point now?
甲、乙两人在河中游泳，先后从某处出发，以同一速度向同一方向游进．现在甲位于乙的前方，乙距起点20米，当乙游到甲现在的位置时，甲将游离起点98米．问：甲现在离起点多少米．
<gadget id="calculator">98 - 20</gadget>
<output>78</output>

<gadget id="calculator">78 / 2</gadget>
<output>39</output>

<gadget id="calculator">39 + 20</gadget>
<output>59</output>

<result>59</result>