exam Maths Puzzle Numerical Ability

Martina Leaves home at 9 A.M., bicycling at at rate of 24/mi/h. Two hours later, John leaves, driving at the rate of 48 mi/h at what time will John Catch up with Martina?

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exam Other Question
Find the difference quotient of the following:

f(x) = 3x-x^2 The graph of a quadratic function f is the graph of y=-2x^2 translated 4 units to the left and 6 units down. What is the equation of function f?