and B travel from A to B, A walks 80 meters per minute, B walks 50 meters per minute, B walks 6 minutes before A, and they arrive at B at the same time, what is the distance between A and B?
甲、乙两人由A到B，甲每分钟走80米，乙每分钟走50米，乙比甲先走6分钟，两人同时到达B地，则A，B两地相距多少米．
<gadget id="calculator">80 - 50</gadget>
<output>30</output>

<gadget id="calculator">6 / 30</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">50 * (1/5) * 80</gadget>
<output>800</output>

<result>800</result>