book Maths Puzzle Numerical Ability

Determine whether g(x)=3x-6 and f(x)=1/3x+2 are inverse functions.

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book Other Question

Gary runs 1 km/h faster than Margie.
They run in opposite directions for 2 hours.
They are then 30 km apart.
How many km/h does Margie run? Q= 5000P + 4,490,000 solve for P