book Maths Puzzle Numerical Ability

Can you help me with this question?
Do I use the pythagorean theorem?? Two planes simultaneously from the airport one flying north and the other east. The northbound plane is fly

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book Other Question

Solve for the indicated variable:
2/w - y = z, solve for w

This is how I solved it, I'm I correct?
1/w = z + y/2

Thanks for your help A rectangle has a length of 8 cm and a diagonal of 10cm. find the rectangles width, perimeter, area?