exam Maths Puzzle Numerical Ability

Help needed please.

Steve traveled 600 miles at a certain speed. Had he gone 20mph faster, the trip would have taken 1 hour less. Find the speed of his vehicle.

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exam Other Question

How would I go about solving a system of equations with three equations and three variables.

4x-4y-z=38
x+4y-3z=6
-3x+2y-z=-14

Please explain step by step, I would appreciate it. Thank you. can someone please help me solve this problem? 3(x-2)-5(2x-1)>0. The greater than sign should have a _ under it.