book Maths Puzzle Numerical Ability

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.

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book Other Question

I need to find the total surface area of a stand that was cut from a right circular cone (now called a frustum of a cone).

The height is 40 cm,bottom radius is 100 cm, and the top radius is 60 cm. Use four unit multipliers to convert 45 sq inches to sq meters.