A and B go from point a to point b at the same time, A walks 60 meters per minute, B walks 90 meters per minute, B returns immediately after arriving at point b, and meets A at a distance of 120 meters from point b. How much rice?
甲、乙二人同时从a地去b地，甲每分走60米，乙每分走90米，乙到达b地后立即返回，在离b地120米处与甲相遇，ab两地相距多少米？
<gadget id="calculator">60 / 90</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) * 120</gadget>
<output>80</output>

<gadget id="calculator">120 + 80</gadget>
<output>200</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">200 / (1/3)</gadget>
<output>600</output>

<result>600</result>