The cuboid reservoir is 40 meters long, 15 meters wide and 2 meters deep. There is 900 cubic meters of water in the reservoir. How many meters is the water surface from the mouth of the reservoir? It's urgent!

Length * width * depth = volume
So there are:
40 * 15 * depth = 900
The water depth is 1.5m
Therefore, the distance between water surface and pool mouth is 2m - 1.5m = 0.5m

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