Two people, A and B, set off from the same place on a ring road at the same time, and walk with their backs facing each other. It takes 60 minutes for A to go around, and they meet after 45 minutes. A immediately turns around and goes in the same direction as B, then How many points does it take for A and B to meet again?
甲乙两人骑自行车从一环形公路的同一地点同时出发，背向而行，甲行一圈要60分钟，在出发45分钟后两人相遇，甲立即调转车头，与乙同向而行，则甲乙再次相遇需要多少分．
<gadget id="calculator">1 / 60</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">1 / 45</gadget>
<output>1/45 = around 0.022222</output>

<gadget id="calculator">(1/45) - (1/60)</gadget>
<output>1/180 = around 0.005556</output>

<gadget id="calculator">(1/60) - (1/180)</gadget>
<output>1/90 = around 0.011111</output>

<gadget id="calculator">1 / (1/90)</gadget>
<output>90</output>

<result>90</result>