book Maths Puzzle Numerical Ability

Use four unit multipliers to convert 45 sq inches to sq meters.

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book Other Question

John leaves his house at 7:30am. His sister,Mary leaves at 8:30am and tries to catch up with John. She is walking 2 km/h faster than him on the same route in the same direction. How would you express this polynomial?
3xy^2(r + 3s) -6y^2(r + 3s)

Also what if it was setup like this, with -6xy^2, instead of -6y^2?
3xy^2(r + 3s) -6xy^2(r + 3s)

Thank You
TSJ