There are two people, A and B, and B’s walking speed is 3/5 of A’s. A and B start from A and B respectively at the same time. If they walk towards each other, they will meet after 1 hour; OK, how long does it take for A to catch up with B?
有甲、乙两人，乙步行的速度是甲的(3/5)，甲、乙两人分别从A、B两地同时出发，若相向而行，则1小时后相遇；若同向而行，则甲需要多少时间才能追上乙？
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

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

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

<gadget id="calculator">8 * (1/2)</gadget>
<output>4</output>

<result>4</result>