A and B originally planned to ride bicycles at the same speed from point A to point B at the same time. As a result, A’s cycling speed decreased by 10% while B’s cycling speed decreased by 20%. 15 minutes. How many minutes were originally planned for the two of them to ride from point A to point B?
甲乙两人原计划以同样的速度骑自行车同时从A地出发开往B地，结果出发时甲骑行的速度降低了10%，而乙骑行的速度降低了20%，这样乙比甲迟到了15分钟．原计划两人从A地到B地要骑行多少分钟．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(9/10) * 120</gadget>
<output>108</output>

<result>108</result>