exam Maths Puzzle Numerical Ability

2 planes leave Chicago-one traveling due east and the other due west. The first travels 100miles per hour faster than the second. How long will it be until they are 2000 miles apart

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3 time the square root of 3/7 - 2 times the square root of 7/3 - the square root of 189 For the following floor plan, determine whether it is possible for a person to walk through each doorway without using any of the doorways twice. If it is possible, determine such