exam Maths Puzzle Numerical Ability

x^2 - 3x-54=0

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exam Other Question

A car travels 400 miles on level terrain in the same amount of time it travels 160 miles on mountainous terrain. If the rate of the car is 30 miles per hour less in the mountains than on level ground, find its rate in the mountains. The age of Mary and Claire are in the ratio 5:7. Four years later their age will be in the ratio 3:4. Find their ages . please help me with this sum i am kind of getting confused and thanks!