exam Maths Puzzle Numerical Ability

A plane flies 720 mi against a steady 30-mi/h headwind and then returns to the same point with the wind. If the entire trip takes 10 h, what is the plane�s speed in still air?

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i need help with
sqaure root -27a^8b^

and 7^343x^2z + 3x^567z

^ means sqaure root and the 2 by ^ on first part of question means the power of the X can you help?
1. 3/x = 7/5

2.5a^2b/12a multiplied by 2a^3b/15ab^6