Assuming the robot is completely submerged, then the water will rise by
(20m^3)/(5m*4m) = 1m
Doesn't really matter how tall the tank is, or how much water is already there, as long as the entire volume of the robot is submerged.
A rectangular tank of 5 m long,4 m wide and 5 m high is filled with water to a depth 3 m. If a robot of volume 20 cubic metre is added to the tank, how much will the water level rise?
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