The distance between Lengshuitan and Lingling is 30 kilometers. A rides a bicycle from Lengshuitan to Lingling and travels 0.4 kilometers per minute. After 10 minutes, a motorcycle drives from Lingling to Lengshuitan and travels 0.9 kilometers per minute. ． How many minutes after the motorcycle is driven, can it meet the bicycle?
冷水滩与零陵两城相距30千米，甲骑自行车从冷水滩去零陵，每分钟行0.4千米，10分钟后一辆摩托车从零陵开往冷水滩，每分钟行0.9千米．摩托车开出多少分钟后，能与自行车相遇？
<gadget id="calculator">0.4 * 10</gadget>
<output>4</output>

<gadget id="calculator">30 - 4</gadget>
<output>26</output>

<gadget id="calculator">0.4 + 0.9</gadget>
<output>1.3</output>

<gadget id="calculator">26 / 1.3</gadget>
<output>20</output>

<result>20</result>