exam Maths Puzzle Numerical Ability

find the suface are of the cone

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exam Other Question

Solve by the Addition Method:

3x+y=5
3y-z=2
x+z=5

For some reason, I'm able to do the problems if each equation has all three of the variables, and unable to do the problem A ship travels from New York to Southampton,England at 33 mph. A plane traveling 605 mph takes 104 hours less to make the same trip. How far apart are the two cities?