book Maths Puzzle Numerical Ability

Two cars start together and travel on 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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I need to simplify (x to the 3rd power m minus t to the 5th power n) squared John owns a hot dog stand. He has found that his profit is represented by the equation P=-x(squared)+70x=76, where P represents profits and x represents the number of hot dogs sold