exam Maths Puzzle Numerical Ability

Graph y =-x

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exam Other Question

One inlet pipe can fill an empty pool in 4 hours, and a drain can empty the pool in 8 hours. How long will it take the pipe to fill the pool if the drain is left open? One pipe can fill a tub in 12 minutes. Another pipe can fill it in only 8 minutes. How long would it take both pipes to fill the tub?