book Maths Puzzle Numerical Ability

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if y varies inversely as x, and y=12 when x=6, what is k, the variation constant?

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book Other Question

2y+18=12-6(y+7) How long will it take a bus traveling at 60 miles per hour to overtake a car traveling at 40 miles per hour if the car had a 1.5-hour head start?