Two people A and B start from A and B at the same time and walk toward each other. After 1 hour, the distance is 56 kilometers. After continuing to drive for 3 hours, the distance is 56 kilometers. Find the distance between A and B.
甲、乙两人从A、B两地同时出发相向而行，1小时后相距56千米，继续行驶3小时后，又相距56千米，求A、B两地间的距离．
<gadget id="calculator">56 + 56</gadget>
<output>112</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">112 / 2</gadget>
<output>56</output>

<gadget id="calculator">56 * 1</gadget>
<output>56</output>

<result>112</result>