Two people set off to the same destination at the same time at the same time. One person rides a bicycle with a speed of 18 km/h, and the other rides a motorcycle with a speed 2.5 times faster than the bicycle. After 2 hours, the person on the motorcycle arrives at the destination. How long will it take for the biker to arrive?
两人同时同地出发前往同一目的地，一人骑自行车，速度是18千米/时，一人骑摩托车，速度是自行车的2.5倍，2小时后，骑摩托车的人到达目的地，那么骑自行车的人还要多久才到？
<gadget id="calculator">18 * 2.5 * 2</gadget>
<output>90</output>

<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<gadget id="calculator">90 - 36</gadget>
<output>54</output>

<gadget id="calculator">54 / 18</gadget>
<output>3</output>

<result>3</result>