book Maths Puzzle Numerical Ability

I need to simplify (x to the 3rd power m minus t to the 5th power n) squared

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A supersonic airplane flies 4 hours from London to New York. At the same time, a subsonic plane flies 8 hours from New York to London. How long will it take for the two planes to c 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?