exam Maths Puzzle Numerical Ability

I do not understand how I turn the square root of (24/25) into (2/5*square root of 6).

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exam Other Question

Bryden got a job as a traffic helicopter pilot. She finds that with a tailwind, a 120km distance takes 45 minutes, but that the return trip (into the wind) takes 1 hour. What is the speed of the helicopter? What is the speed of the wind? Richard drove his rig at �x� mph for 3 hours, then increased his speed to (x + 15) mph and drove 2 more hours. Write a polynomial that represents the total distance that he traveled. How much distance he covered if x = 45 Mph?