Two people, A and B, ride bicycles from two places in the north and the south that are 90 kilometers apart at the same time, and walk towards each other. A travels 10 kilometers per hour and B's speed is 1.25 times that of A. How long does it take for the two to meet?
甲乙两人骑自行车从相距90千米的南北两地同时出发，相向而行．甲每小时行10千米乙的速度是甲的1.25倍，经过多长时间两人相遇？
<gadget id="calculator">10 * 1.25</gadget>
<output>12.5</output>

<gadget id="calculator">10 + 12.5</gadget>
<output>22.5</output>

<gadget id="calculator">90 / 22.5</gadget>
<output>4</output>

<result>4</result>