exam Maths Puzzle Numerical Ability

I need help with this

A Go-ped traveled 9 miles in 24 minutes.
How long would it take to go 27 miles?

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exam Other Question

5x - y=25
5x +6y= -10
Solve then graph then classify if it is consistant or inconsistant, dependant or independant.
Can someone please help me with this one?? Add or subtract as indicated. (finding LCD)

b/b-1 + 2b/b^2-1

a-1/a+1 + a+1/a-1

4/a-5 - 1/5-a

It would be cool if someone could explain that to me!