There are two people, A and B. A travels from A to B at a speed of 7 kilometers per hour. After 3 hours, B also travels from A to B at a speed of 8 kilometers per hour. After B starts 5 hours later, the speed The original speed has been increased by 50%. As a result, B arrives at B 2 hours earlier than A. Find the distance between A and B?
有甲、乙两人，甲以每小时7千米的速度从A地去B地，3小时后，乙以每小时8千米的速度也从A到B地，乙出发5小时后，速度增加了原速度的50%，结果乙比甲早到B地2小时，求A、B两地间的距离？
<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 7</gadget>
<output>35</output>

<gadget id="calculator">8 - 7</gadget>
<output>1</output>

<gadget id="calculator">1 * 5</gadget>
<output>5</output>

<gadget id="calculator">35 - 5</gadget>
<output>30</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">8 * (3/2)</gadget>
<output>12</output>

<gadget id="calculator">12 - 7</gadget>
<output>5</output>

<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<gadget id="calculator">12 * 6</gadget>
<output>72</output>

<gadget id="calculator">40 + 72</gadget>
<output>112</output>

<result>112</result>