exam Maths Puzzle Numerical Ability

One car travels 60mph and another one travels 45mph. If they start from the same place at the same time and travel in the same direction, after how many hours will the faster car be 50 miles ahead of the slower car?

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exam Other Question
Solve 1/3x2-1/2x=1/6. The 2 beside the 1/3x is supposed to represent squared. I do not understand these problems at all, could someone please help me?

The following equation represents an ellipse. True or False?
(x-3)^2/1 + (y+1)^2/25