exam Maths Puzzle Numerical Ability

(x^-1 - y^-1)^-1

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Perform the indicated oeprations. Write fractional answers as mixed numbers or as proepr fractions reduced to lowest terms.

21 7/8 + 3 3/4 = a canoeist can travel 10 mph in calm water. the amount of time it takes to travel 60 miles with the current is the same amount of time it takes to travel 40 miles against the current. find the rate of the current.