A is going from A to B, and B and C are going from B to A. The three start at the same time. A first meets B on the way, and then meets C again in 15 minutes. A walks 70 meters per minute, and B walks every minute. Walk 60 meters per minute, and C walks 50 meters per minute. Ask: How many meters are there between A and B?
甲从A地往B地，乙、丙两人从B地往A地，三人同时出发，甲首先在途中与乙相遇，之后15分钟又与丙相遇，甲每分钟走70米，乙每分钟走60米，丙每分钟走50米，问：A、B两地相距多少米？
<gadget id="calculator">70 + 50</gadget>
<output>120</output>

<gadget id="calculator">60 - 50</gadget>
<output>10</output>

<gadget id="calculator">15 / 10</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">70 + 60</gadget>
<output>130</output>

<gadget id="calculator">120 * (3/2) * 130</gadget>
<output>23_400</output>

<result>23_400</result>