depth of water

Problem
A closed cylindrical tank measures 12 ft. long and 5 ft. in diameter. It has to contain water to a depth of 3 ft when lying in the horizontal position. Find the depth of water when it is in vertical position.
 

Situation
A closed conical vessel has a base radius of 2 m and is 6 m high. When in upright position, the depth of water in the vessel is 3 m.
 

Part 1: What is the volume of water?
A. 22 m³
B. 25 m³
C. 28 m³
D. 32 m³
 

Part 2: If the vessel is held in inverted position, how deep is the water?
A. 4.53 m
B. 5.74 m
C. 4 m
D. 5 m
 

Part 3: What is the weight of water in quintals. Unit weight of water is 9,800 N/m³.
A. 263.4
B. 195.4
C. 219.7
D. 247.2