exam Maths Puzzle Numerical Ability

During rush hour, Fernando can drive 45 miles using the side roads in the same time that it takes to travel 30 miles on the freeway. If Fernando's rate on the side roads is 9 mi/h

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exam Other Question
The smaller of two numbers is 12 less than the larger. One-half of their sum is 46. Find the numbers. expand by use of minors.
3 4 -2
6 4 3
0 4 2