exam Maths Puzzle Numerical Ability

A plane flies 440 miles with the wind and 320 miles against the wind in the same length of time. If the speed of the wind is 30 mph, What is the speed of the plane in still air?

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32 Find formula for inverse function

f use the properties for radicals to simplify each of the following expressions. Asume that all variables represent positive real numbers.

/(5/3)