exam Maths Puzzle Numerical Ability

A bicyclist rode into the country for 5 hours. In returning, her speed was 5 miles an hour faster and the trip took 4 hours. what was her speed each way?

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exam Other Question
what is the length of a rectangle that is twice the width; with a perimeter that is 42 inches. find the width Please help w/ the following:

2x^-2+3x^-1+1=0

Thank you.