exam Maths Puzzle Numerical Ability

During rush hour, Adriana can drive 30 miles using the side roads in the same time that it takes to travel 15 miles on the freeway. If Adriana's rate on the side roads is 6 mi/h faster than her rate on the freeway, find her rate on the side roads.

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exam Other Question
With only the small valve open, all of the liquid can be drained from a large vat in 4 hours. With only the large valve open, all of the liquid can be drained from the same vat in 2 hours. How long would it take to drain the vat with both valves open?

(4x^2*y^3*z/yz)*x^2