Patti's Pet Palace has a 90-gallon fish tank. When it needs to be cleaned, it can be drained at a rate of 2 gallons per minute.
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right-handThe triangles are similar if, the ratios of their sides are equal
On the left-hand side
and in the right-hand side, we have
The left-hand side equals the right-hand side; therefore, the triangles are similar.