The distance between A and B is 4600 meters. Zhang Ping and Wang Liang start from the two places respectively and walk towards each other. After Zhang Ping walks at a speed of 80 m/min for 15 minutes, Wang Liang starts again. Wang Liang met Zhang Ping after walking for 20 minutes. Seek Wang Liang's speed.
甲乙两地相距4600米，张平、王亮两人分别从两地出发，相向而行，张平以80米/分的速度步行15分钟后，王亮再出发．王亮步行20分钟后与张平相遇．求王亮的速度．
<gadget id="calculator">80 * 15</gadget>
<output>1_200</output>

<gadget id="calculator">4_600 - 1_200</gadget>
<output>3_400</output>

<gadget id="calculator">3_400 / 20</gadget>
<output>170</output>

<gadget id="calculator">170 - 80</gadget>
<output>90</output>

<result>90</result>