exam Maths Puzzle Numerical Ability

square root of x+20 then -x = 0

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Martha leaves home at 9:am, bicycling at a rate of 24 mi/h. Two hours later, John leaves, driving at the rate of 48 mi/h. At what time will John catch up with Marth?
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If the hypotenuse of a right triangle is 12 feet and a side is 6 feet, what is the length of the other side. Express your answer in radical form.