book Maths Puzzle Numerical Ability

can you please help me with {x+y=12
{x-y=2

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Can someone please help me with this problem I have been working on it all day.
Multiply
(x-2)(3x-6)(x+3)
Two cars are 2 miles apart on a staright road, traveling in the same direction. The lead car travels 25 mph and the trailing car travels at 35 mph. How long does it take the faster