exam Maths Puzzle Numerical Ability

Two cars start together and travel in the same direction, one going twice as fast as the other. At the end of 3 hours, they are 96 miles apart. How fast is each car traveling?

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Will you help me solve this px

7. (4 pts) A drinking glass is in the shape of a cylinder that is 60mm in diameter and 15cm tall. How many cubic centimeters of water will it hold?
3x+2y-3z=8
2x+3y+2z=10
x+y-z=2

how to solve system of 3 linear equations in 3 variables by the addition method. I keep coming up with fractions for my x and z variables. any help would be appreciated.