book Maths Puzzle Numerical Ability

use two unit multipiers to convert 366 centimeters to feet

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book Other Question

Why multiplying or dividing like sings yield a positive answer?
Why multiplying or dividing different signs yield a negative answer? It takes a freight train 2 hrs longer to travel 300 miles than it takes an express train to travel 280 miles. The rate of the express train is 20 miles per hour greater than the rate of the freight train. Find the times and rates of both trains.