exam Maths Puzzle Numerical Ability

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Can someone please help me with this math problem I don't really understand it at all. I have been trying very hard to understand it so can you please help me. If you can

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A seweage treatment plant has two inlet pipes to its settling pond. One can fill the pond in 10hr, the other in 12hr If the first pipe is open for 5hrs and then the second pipe is opened, how long will it take to fill the pond. Evaluate the functions for the values of x given as 1,2,4,8, and 16. Describe the differences in the rate at which each function changes with increasing values of x. PLEASE SHOW A