A and B are practicing running on the circular road. If they start at the same time at the same place, A catches up with B every 16 minutes. If they start at the same time in the opposite direction, they meet every 4 minutes. Ask A How many minutes does it take to run around?
甲、乙两人在环行道上练习跑步，如果两人同时同地同向出发，每隔16分钟甲追上乙一次，如果同时同地反向出发，每隔4分钟两人相遇一次，求甲跑一圈要用多少分钟？
<gadget id="calculator">1 / 16</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/16) + (1/4)</gadget>
<output>5/16 = around 0.3125</output>

<gadget id="calculator">(5/16) / 2</gadget>
<output>5/32 = around 0.15625</output>

<gadget id="calculator">1 / (5/32)</gadget>
<output>32/5 = around 6.4</output>

<result>32/5 = around 6.4</result>