book Maths Puzzle Numerical Ability

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?

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book Other Question
find the slope of a line through the points (-2,-1) and (4,2) Determine whether g(x)=3x-6 and f(x)=1/3x+2 are inverse functions.

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