exam Maths Puzzle Numerical Ability

I really dont get equations, can you help me?

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exam Other Question

Steve traveled 200 miles at a certain speed. Had he gone 10mph faster, the trip would have taken 1 hour less. Find the speed of his vehicle. If the average (arithmetic mean) of x and y is k, which of the following is the average of x, y, and z?

(A) 2k + z/3
(B) 2k +z/2
(C) k+z/3
(D) k+z/2
(E) 2(k+z)/3