📚 How to solve rate problems leading to fractional equations (Question 3, Flow Rate)

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Q. A small hydroelectric generating station can produce 61 gigajoules (GJ) of energy per year. After 4.0 months of operation, another generator is added which, by itself, can produce 39 GJ in 5.0 months. How many additional months are needed for a total of 95 GJ to be produced?

Fluid or energy flow:

Amount of flow = flow rate × time