Two people, A and B, start from A and B at the same time and walk towards each other. The speed of B is (3/4) the speed of A. After they meet, they continue to move forward. After A arrives at B and B arrives at A They all return immediately along the original road. It is known that the place where the two met for the second time is 60 kilometers away from the place where they met for the first time. How many kilometers is the distance between A and B?
甲、乙二人分别从A、B两地同时出发，相向而行，乙的速度是甲的速度的(3/4)，二人相遇后继续行进，甲到达B地和乙到达A地后都立即沿原路返回，已知二人第二次相遇的地点距第一次相遇的地点60千米，则A、B两地相距多少千米？
<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(4/7) * 3</gadget>
<output>12/7 = around 1.714286</output>

<gadget id="calculator">2 - (12/7)</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(4/7) - (2/7)</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">60 / (2/7)</gadget>
<output>210</output>

<result>210</result>