book Maths Puzzle Numerical Ability

z+3z=-8

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I need some help trying to sovle this problom every time i try to solve it. it comes out to 5 but thats wrong tho.

4(a-2)=2(a-1) A bicyclist took a ride to the country and it took 5 hours. To get back she went 5mph faster and it took 4 hours. What were the speeds, going and coming?