book Maths Puzzle Numerical Ability

how long would it take to travel 150 miles at 90 miles per hour

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A coffee wholesaler blends together three types of coffee that sell for $1.95, $2.10, and $2.25 per pound so as to obtain 100 pounds of coffee worth $2.13 per pound. If the wholes True of false: A function f is decreasing on an open interval I, if for any choice of x1, and x2 in I, with x1 < x2, we have f(x1) > f(x2).