exam Maths Puzzle Numerical Ability

A 8 horsepower pump fills a tank in 8 hours. A 3 horsepower pump fills it in 12 hours. Both pumps are turned on and begin to fill the tank. After 4 hours the 8 horsepower pump breaks. How long will it take the 3 horsepower pump to finish?

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exam Other Question
51. You now have had practice solving equations with one variable and equations with two variables. Compare equations with one variable to equations with two variables. How are the what I need to siplify is 5x(squared) + 15x over x(cubed) + 27.