Two oil tanks, A and B, if 5 kg of oil is drained per minute, tank A will drain the oil in 52 minutes, and tank B will drain the oil in 36 minutes. If oil is filled from tank A to tank B, how many minutes does it take for the two tanks to be equal?
甲、乙两个油罐，如果每分钟放油5千克，甲罐52分钟把油放尽，乙罐36分钟把油放完．如果从甲罐向乙罐注油，需要过多少分钟两罐油相等？
<gadget id="calculator">52 * 5</gadget>
<output>260</output>

<gadget id="calculator">36 * 5</gadget>
<output>180</output>

<gadget id="calculator">260 - 180</gadget>
<output>80</output>

<gadget id="calculator">80 / 2 / 5</gadget>
<output>8</output>

<result>8</result>