book Maths Puzzle Numerical Ability

What is the change in velocity of a car that is traveling at 100km/h north, but is traveling 80km/h south one minute later? What is its average acceleration

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Denchin Donuts sells donuts for 20 cents each plus 15 cents for the box in which they come. Build a table A certain noise produces 3.49x10^-5 watts/mt of power. What is the decibel?