A cuboid reservoir is 30 meters long, 20 meters wide, 2 meters high, and 1.5 meters deep. Now it is necessary to use a water pump to drain water outwards. If 3 cubic meters of water are discharged every minute, how many minutes will it take to drain all the water in the pool?
一个长方体蓄水池底面长30米、宽20米，高2米，池中水深1.5米．现要用水泵向外排水，如果每分钟排出水3立方米，需要多少分钟才能把池中的水全部排完？
<gadget id="calculator">1.5 / 3</gadget>
<output>0.5</output>

<gadget id="calculator">30 * 2 * 0.5</gadget>
<output>30</output>

<result>30</result>