exam Maths Puzzle Numerical Ability

y=3x+5

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exam Other Question

The time t required to drive a fixed distance varies inversely as the speed r. It takes 5hr at 55mph to drive a fixed distance. How long would it take at 40mph? Can you help me divide and simplify:

18x^2+17+4/8x-12 divided by 9x^2+4x/24x-36