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1. The length of the height of the prism is 6 m

   Calculating the volume of a prism

   From the question, we are to determine the length of the height of the prism

   The volume of a prism is given by the formula,

   Volume = width × base × height

   Thus,

   Height = Volume / (width × base)

   From the given information,

   base = 5 m

   width =  3m

   Volume = 90 m³

   Putting the parameters into the formula, we get

   Height = 90 /(3 × 5)

   Height = 90 / 15

   Height = 6 m

   Hence, the length of the height of the prism is 6 m

   Learn more on Calculating volume here: https://brainly.com/question/23766958

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