exam Maths Puzzle Numerical Ability

-9-/108 over 3

(/ is the radical sign)

Thanks for all your help...step by step help would help a lot!
CH

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an aircraft going from city A to city B on a bearing of s69degreesE is traveling at a speed of 430 miles per hour. the wind is blowing out of the north to south at a speed of 25 m How many three digit numbers can be formed using the digits 1,2,3,4,5,6 and 7 if no digit can be replaced in a number? I have a slight Idea on how to do this but I get stuck every