exam Maths Puzzle Numerical Ability

Simplify

x + (3b/x + 2/b)

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Can someone please help me with this question? Thank you so much for all your help!

Simplify.

1+ 2/3 over 2 + 1/2 An airplane travels from points A and B with a distance of 1500 km and a wind along its flight line. If it takes the airplane 2 hours from A to B with the tailwind and 2.5 from B to A with the headwind, what is the velocity?