book Maths Puzzle Numerical Ability

Two planes leave simultaneously from the same airport, one flying due east and the other flying due south. The eastbound plane is flying 100 mph faster then the southbound plane.

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book Other Question

What is the sum of the first 500 odd digits? 1 + 3 + 5 + ... + 501 = ?
And what is the sum of the first 500 even digits? 2 + 4 + 6 + ... + 502 = ? Complete the follow equation. Your answers will be algebraic expressions. (a+bi)^2= ??? + ??? i