book Maths Puzzle Numerical Ability

What is (2 - 3i)(1 - 4i)?

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(1/cx^2-4c+dx^2-4d+2/cx+2c+xd+2d)/((3/x^2-4)-(4/xc+xd-2c-2d) Pablo is driving 40 miles per hour. After he has driven 30 miles, his brother Ricardo starts driving in the same direction. At what rate must Ricardo drive to catch up with Pablo