exam Maths Puzzle Numerical Ability

If a runner runs a 42.2 km course in 2.114 hours, what is his average speed?

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exam Other Question

How do you solve this equation??
5x-y=10
7x-2y=11
Please help me solve this equation:

frac{3x^2-26x+80}{(x-6)(x-4)(x+2)} - frac{3}{x + 2}


the final answer should be written as:
frac{a}{x^2+bx+c}

Here a,b and c are ordinary numbers.