Two people, A and B, start from the same place on the ring road by bicycle and walk with their backs. Now it is known that it takes 75 minutes for A to go around. If they meet at the 50th minute after departure, how many minutes will it take for B to go around ．
甲、乙两人骑车从环形公路上的同一地点出发，背向而行，现在已知甲走一圈需要75分钟，如出发后第50分钟两人相遇，那么乙走一圈需要多少分钟．
<gadget id="calculator">75 - 50</gadget>
<output>25</output>

<gadget id="calculator">1 / 25</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">1 / 50</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">(1/25) / (1/50)</gadget>
<output>2</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">75 / (1/2)</gadget>
<output>150</output>

<result>150</result>