exam Maths Puzzle Numerical Ability

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?

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exam Other Question
Criticize the following claims, which were cited in the New York Times of September 25, 1987 and October 21, 1987:

a new dental rinse "reduces plaque on teeth by over 300%"

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