exam Maths Puzzle Numerical Ability

some bacteria were in the microscope and doubles its size every six minutes. in 2 hours the slide is fully covered. when was it half covered?

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exam Other Question

how do you solve in steps I am not to sure how to simplify and divide rational expressions, could some one please help me with this problem.
(2x^2 + 5x - 12/ 9x^2 - 16) /(2x^2 - 7x + 6/ 3x^2 - x - 4)

Thank you in advance for your help.