book Maths Puzzle Numerical Ability

A 15 foot ladder is leaning against a wall. It's base is moving at a constant rate of 2 ft per second away from the wall. What is the rate of change of the area formed by the lad

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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 do you do 4-3(2y-8)-2y