Xiaodong and grandpa went for a walk in the playground together. It takes Xiaodong 10 minutes to walk around, and it takes 16 minutes for Grandpa to walk around. If two people start from the same place at the same time and walk towards each other, how many minutes later will they meet?
小东和爷爷一起去操场散步．小东走一圈需要10分钟，爷爷走一圈需要16分钟．如果两人同时同地出发，相背而行，多少分钟后相遇？
<gadget id="calculator">18 / 13</gadget>
<output>18/13 = around 1.384615</output>

<result>18/13 = around 1.384615</result>