Two people, A and B, are walking towards each other from A and B respectively at speeds of 3 km and 5 km per hour. After meeting, the two continue to walk forward. If A travels from the meeting point to B for 4 hours, how many kilometers are there between A and B?
甲、乙二人分别以每小时3千米和5千米的速度从A、B两地相向而行．相遇后二人继续往前走，如果甲从相遇点到达B地共行4小时，那么A、B两地相距多少千米．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">4 * (3/5)</gadget>
<output>12/5 = around 2.4</output>

<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">(12/5) * 8</gadget>
<output>96/5 = around 19.2</output>

<result>96/5 = around 19.2</result>