cyclist is practicing on a circular track. It takes 45 seconds for A to complete a lap, and 50 seconds for B to complete a lap. If A and B set off in the same direction at the same time, how long will it take at least to reach the same speed at the same time? Meet at the starting point?
自行车运动员在一个圆形的跑道上进行练习，甲行一圈需要45秒，乙行一圈需要50秒，如果甲、乙二人同时同地按一个方向出发，最少要经过多长时间才能同时在出发点相遇？
<gadget id="calculator">2 * 3 * 5</gadget>
<output>30</output>

<result>30</result>