A and B start from the same place and go in the same direction, and A starts before B. A departs and arrives at A in 6 minutes. At this time, B is 150 meters away from the starting point. After another 3 minutes, B arrives at point A, and at this time, A is 900 meters away from the starting point. Q: How long does B leave later than A?
甲、乙两人从同一个地点出发同向而行，甲比乙先出发．甲出发6分钟到达A地．此时乙距离起点150米．又过了3分钟乙到达A地，此时甲距离起点900米．问：乙比甲晚出发多长时间？
<gadget id="calculator">6 + 3</gadget>
<output>9</output>

<gadget id="calculator">900 / 9</gadget>
<output>100</output>

<gadget id="calculator">100 * 6</gadget>
<output>600</output>

<gadget id="calculator">600 - 150</gadget>
<output>450</output>

<gadget id="calculator">450 / 3</gadget>
<output>150</output>

<gadget id="calculator">150 / 150</gadget>
<output>1</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<result>5</result>