exam Maths Puzzle Numerical Ability

2x-y+z=-2

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exam Other Question

Solve the system of equations for x and y:
4^(x+y)=1/64 & sqrt6^(x+8y)=216^2/3
Can someone please tell me if I have the correct answer???? I got x=-4 and y=1?
not in book Help!!

Mandy begins bicycling west at 30 miles per hour at 11 am. If Liz leaves from the same point 20 minute latera bicycling west at 36 miles per hour, when will she catch Mandy?