book Maths Puzzle Numerical Ability

PLANE "A" CAN TRAVEL 1400 MI. IN ONE HOUR LESS TIME THAN IT TAKES PLANE "B" TO TRAVEL 2000 MILES. THE RATE OF PLANE "B" IS 50 MPH GREATER THAN THAT OF PLANE "A". FIND THE RATES O

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solve the quadratic equation: 9d^2-81=0
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A rectangular garden is 15 by 12 meters, you need to have a rectangular area inside such that a uniform strip of side walk is made, the area inside has to be 108 square meters. Find the dimensions of the interior area.