Ao Zebra and Koizumi set off from EQ City and IQ City at the same time respectively and head towards each other. After starting for a period of time, they meet at a distance of 240 meters from the midpoint; if the zebra stops somewhere on the way after starting, they will also meet at a distance of 240 meters from the midpoint. It is known that the zebra travels 160 meters per minute, Koizumi walks 120 meters per minute. How many minutes did the zebra stop on the way?
奥斑马、小泉分别从EQ城、IQ城同时出发相向而行．出发一段时间后，他们在距中点240米处相遇；如果奥斑马出发后在途中某地停留了一会儿，他们还将在距中点240米处相遇，已知奥斑马每分钟行160米，小泉每分钟行120米．奥斑马在途中停留了多少分钟？
<gadget id="calculator">2 / 120</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">240 * (1/60)</gadget>
<output>4</output>

<result>4</result>